diff --git a/scripts/__init__.py b/scripts/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/scripts/probe_unknowns.py b/scripts/probe_unknowns.py
new file mode 100644
index 0000000..8ef9b6d
--- /dev/null
+++ b/scripts/probe_unknowns.py
@@ -0,0 +1,189 @@
+"""未知字段探测脚本：通过批量拉取多只股票数据，尝试推断各 unknown_N 字段的含义。
+
+用法：
+    cd /home/m/xmtdx
+    python3 scripts/probe_unknowns.py
+
+输出：
+    1. MinuteBar.unknown_1 vs 分钟均价（累计成交额 / 累计成交量）
+    2. SecurityQuote.unknown_2/3/5/6/7/8 与已知行情指标的相关关系
+"""
+from __future__ import annotations
+
+import sys
+import pathlib
+
+sys.path.insert(0, str(pathlib.Path(__file__).parent.parent / "src"))
+
+from xmtdx import TdxClient, Market, KlineCategory
+
+HOST = "180.153.18.170"
+
+# 沪深各取若干活跃股票
+SH_CODES = ["600000", "600036", "601318", "600519", "601628"]
+SZ_CODES = ["000001", "000002", "000858", "002415", "300750"]
+
+SEP = "-" * 72
+
+
+# ---------------------------------------------------------------------------
+# Part 1: MinuteBar.unknown_1 — 是否为分钟均价？
+# ---------------------------------------------------------------------------
+
+def probe_minute_unknown_1(c: TdxClient) -> None:
+    print(SEP)
+    print("Part 1: MinuteBar.unknown_1 vs 分钟均价 (历史某日)")
+    print(SEP)
+
+    # 使用历史分时，数据确定（不随时间变化）
+    DATE = 20250108
+    code, market = "600000", Market.SH
+
+    bars = c.get_history_minute_time_data(market, code, DATE)
+    print(f"  {market.name} {code}  日期={DATE}  共 {len(bars)} 条分时\n")
+
+    # 同时拉取当日日线 K 作为参考（含 amount/vol 可算均价）
+    # 分时数据无直接成交额，需要用 price × vol 近似
+    # 若 unknown_1 == round(price × 100) 则为原始价格单位均价
+    print(f"  {'分钟':>6}  {'price':>8}  {'vol':>8}  {'unknown_1':>12}  {'price*100':>10}  {'diff':>8}")
+    print(f"  {'':-<6}  {'':-<8}  {'':-<8}  {'':-<12}  {'':-<10}  {'':-<8}")
+
+    exact_match = 0
+    close_match = 0
+
+    for i, b in enumerate(bars[:30]):  # 只打印前30条
+        price_x100 = round(b.price * 100)
+        diff = b.unknown_1 - price_x100
+        exact = b.unknown_1 == price_x100
+        close = abs(diff) <= 2
+
+        if exact:
+            exact_match += 1
+        if close:
+            close_match += 1
+
+        flag = " <<< exact" if exact else (" ≈" if close else "")
+        print(f"  {i+1:>6}  {b.price:>8.2f}  {b.vol:>8}  {b.unknown_1:>12}  {price_x100:>10}  {diff:>+8}{flag}")
+
+    # Count across all bars
+    all_exact = sum(1 for b in bars if b.unknown_1 == round(b.price * 100))
+    all_close = sum(1 for b in bars if abs(b.unknown_1 - round(b.price * 100)) <= 2)
+
+    print(f"\n  全部 {len(bars)} 条：")
+    print(f"    unknown_1 == price*100 (精确): {all_exact}/{len(bars)} ({100*all_exact/len(bars):.1f}%)")
+    print(f"    unknown_1 ≈ price*100 (±2):    {all_close}/{len(bars)} ({100*all_close/len(bars):.1f}%)")
+
+    # Try another hypothesis: unknown_1 is a cumulative average price (均价)
+    # Compute running avg: sum(price*vol)/sum(vol)
+    print(f"\n  另一假设：unknown_1 = 当日累计均价×100")
+    cum_pv = 0.0
+    cum_v = 0
+    correct_avg = 0
+    for b in bars:
+        cum_pv += b.price * b.vol
+        cum_v += b.vol
+        if cum_v > 0:
+            avg = cum_pv / cum_v
+            expected = round(avg * 100)
+            if abs(b.unknown_1 - expected) <= 2:
+                correct_avg += 1
+
+    print(f"    unknown_1 ≈ 累计均价×100 (±2): {correct_avg}/{len(bars)} ({100*correct_avg/len(bars):.1f}%)")
+
+
+# ---------------------------------------------------------------------------
+# Part 2: SecurityQuote.unknown_N fields
+# ---------------------------------------------------------------------------
+
+def probe_quote_unknowns(c: TdxClient) -> None:
+    print(f"\n{SEP}")
+    print("Part 2: SecurityQuote.unknown_2/3/5/6/7/8 — 与已知字段的关系")
+    print(SEP)
+
+    pairs = [(Market.SH, code) for code in SH_CODES] + [(Market.SZ, code) for code in SZ_CODES]
+    quotes = c.get_security_quotes(pairs)
+
+    print(f"  {'market':>6}  {'code':>8}  {'pre_close':>10}  {'price':>8}  "
+          f"{'u2':>6}  {'u3':>8}  {'u5':>6}  {'u6':>6}  {'u7':>6}  {'u8':>6}  {'rise_spd':>10}")
+    print(f"  {'':-<6}  {'':-<8}  {'':-<10}  {'':-<8}  "
+          f"{'':-<6}  {'':-<8}  {'':-<6}  {'':-<6}  {'':-<6}  {'':-<6}  {'':-<10}")
+
+    for q in quotes:
+        pct = (q.price - q.pre_close) / q.pre_close * 100 if q.pre_close else 0
+        print(
+            f"  {q.market.name:>6}  {q.code:>8}  {q.pre_close:>10.2f}  {q.price:>8.2f}  "
+            f"{q.unknown_2:>6}  {q.unknown_3:>8}  {q.unknown_5:>6}  "
+            f"{q.unknown_6:>6}  {q.unknown_7:>6}  {q.unknown_8:>6}  {q.rise_speed:>10.4f}"
+        )
+
+    print(f"\n  注：rise_speed = reversed_bytes9/100（已确认 = 涨速）")
+
+    # Hypothesis: unknown_3 might relate to 涨停/跌停 price
+    # 涨停 = pre_close * 1.10 (rounded to 2 decimal)
+    print(f"\n  假设 unknown_3 = 涨停价×100：")
+    print(f"  {'code':>8}  {'涨停价×100 预期':>16}  {'unknown_3':>10}  {'diff':>6}")
+    for q in quotes:
+        if q.pre_close > 0:
+            limit_up = round(q.pre_close * 1.10 * 100)
+            diff = q.unknown_3 - limit_up
+            print(f"  {q.code:>8}  {limit_up:>16}  {q.unknown_3:>10}  {diff:>+6}")
+
+    print(f"\n  假设 unknown_3 = 跌停价×100：")
+    print(f"  {'code':>8}  {'跌停价×100 预期':>16}  {'unknown_3':>10}  {'diff':>6}")
+    for q in quotes:
+        if q.pre_close > 0:
+            limit_dn = round(q.pre_close * 0.90 * 100)
+            diff = q.unknown_3 - limit_dn
+            print(f"  {q.code:>8}  {limit_dn:>16}  {q.unknown_3:>10}  {diff:>+6}")
+
+    # unknown_2: often -1 or small value — check if it's 换手率×10000 or similar
+    print(f"\n  unknown_2 raw values: {[q.unknown_2 for q in quotes]}")
+    print(f"  unknown_5 raw values: {[q.unknown_5 for q in quotes]}")
+    print(f"  unknown_6 raw values: {[q.unknown_6 for q in quotes]}")
+    print(f"  unknown_7 raw values: {[q.unknown_7 for q in quotes]}")
+    print(f"  unknown_8 raw values: {[q.unknown_8 for q in quotes]}")
+
+    # Print raw bytes for manual inspection
+    print(f"\n  原始字节（前20字节 hex）：")
+    for q in quotes:
+        print(f"    {q.code}: {q._raw[:20].hex()}")
+
+
+# ---------------------------------------------------------------------------
+# Part 3: TransactionRecord.unknown_last — 是否为秒数？
+# ---------------------------------------------------------------------------
+
+def probe_transaction_unknown_last(c: TdxClient) -> None:
+    print(f"\n{SEP}")
+    print("Part 3: TransactionRecord.unknown_last — 是否为秒或序号？")
+    print(SEP)
+
+    recs = c.get_history_transaction_data(Market.SH, "600000", 20250108, 0, 30)
+    print(f"  {'序号':>4}  {'时间':>6}  {'price':>8}  {'vol':>6}  {'buy':>4}  {'unknown_last':>14}")
+    print(f"  {'':-<4}  {'':-<6}  {'':-<8}  {'':-<6}  {'':-<4}  {'':-<14}")
+
+    for i, r in enumerate(recs):
+        print(f"  {i+1:>4}  {r.hour:02d}:{r.minute:02d}  {r.price:>8.2f}  {r.vol:>6}  {r.buyorsell:>4}  {r.unknown_last:>14}")
+
+    unique = len({r.unknown_last for r in recs})
+    print(f"\n  unknown_last 唯一值数量: {unique}/{len(recs)}")
+    print(f"  值分布: {sorted({r.unknown_last for r in recs})}")
+
+
+# ---------------------------------------------------------------------------
+# main
+# ---------------------------------------------------------------------------
+
+def main() -> None:
+    print(f"连接 {HOST}:7709 ...")
+    with TdxClient(HOST) as c:
+        probe_minute_unknown_1(c)
+        probe_quote_unknowns(c)
+        probe_transaction_unknown_last(c)
+
+    print(f"\n{SEP}")
+    print("探测完成。根据以上输出可判断各字段含义，更新 models/ 文档注释。")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/xmtdx/__init__.py b/src/xmtdx/__init__.py
index a984ba8..d34dbbd 100644
--- a/src/xmtdx/__init__.py
+++ b/src/xmtdx/__init__.py
@@ -22,6 +22,7 @@ asyncio 版本::
 
 from .client import AsyncTdxClient, TdxClient
 from .exceptions import TdxCommandError, TdxConnectionError, TdxDecodeError, TdxError
+from .transport.sync import KNOWN_HOSTS, ping_all
 from .models import (
     XDXR_CATEGORY_NAMES,
     CompanyInfoCategory,
@@ -58,6 +59,9 @@ __all__ = [
     "TdxConnectionError",
     "TdxDecodeError",
     "TdxCommandError",
+    # 工具
+    "ping_all",
+    "KNOWN_HOSTS",
 ]
 
 __version__ = "0.1.0"
diff --git a/src/xmtdx/client.py b/src/xmtdx/client.py
index a6a620b..b10fb28 100644
--- a/src/xmtdx/client.py
+++ b/src/xmtdx/client.py
@@ -1,7 +1,9 @@
 """高层行情 API：TdxClient（同步）和 AsyncTdxClient（asyncio）。"""
 
 from types import TracebackType
+from typing import TypeVar
 
+from .commands.base import BaseCommand
 from .commands.company_info import GetCompanyInfoCategoryCmd, GetCompanyInfoContentCmd
 from .commands.finance_info import GetFinanceInfoCmd
 from .commands.minute_time import GetHistoryMinuteTimeDataCmd, GetMinuteTimeDataCmd
@@ -11,6 +13,7 @@ from .commands.security_list import GetSecurityListCmd
 from .commands.security_quotes import GetSecurityQuotesCmd
 from .commands.transaction import GetHistoryTransactionDataCmd, GetTransactionDataCmd
 from .commands.xdxr_info import GetXdxrInfoCmd
+from .exceptions import TdxConnectionError
 from .models.bar import SecurityBar
 from .models.enums import KlineCategory, Market
 from .models.finance import CompanyInfoCategory, FinanceInfo, XdxrRecord
@@ -18,10 +21,10 @@ from .models.quote import SecurityQuote
 from .models.security import SecurityInfo
 from .models.timeseries import MinuteBar, TransactionRecord
 from .transport.async_ import AsyncTdxConnection
-from .transport.sync import TdxConnection
+from .transport.sync import KNOWN_HOSTS, TdxConnection, ping_all
 
-_DEFAULT_HOST = "180.153.18.170"
 _DEFAULT_PORT = 7709
+_T = TypeVar("_T")
 
 
 # ============================================================
@@ -30,22 +33,66 @@ _DEFAULT_PORT = 7709
 
 
 class TdxClient:
-    """同步通达信行情客户端。
+    """同步通达信行情客户端，支持 IP 优选与断线自动重连。
 
     使用示例::
 
+        # 单台服务器
         with TdxClient("180.153.18.170") as c:
             bars = c.get_security_bars(Market.SH, "600000", KlineCategory.DAY, 0, 100)
+
+        # 自动从候选列表中选延迟最低的服务器
+        with TdxClient.from_best_host() as c:
+            count = c.get_security_count(Market.SH)
     """
 
     def __init__(
         self,
-        host: str = _DEFAULT_HOST,
+        host: str = KNOWN_HOSTS[0],
         port: int = _DEFAULT_PORT,
         timeout: float = 15.0,
+        auto_reconnect: bool = True,
     ) -> None:
+        self._host = host
+        self._port = port
+        self._timeout = timeout
+        self._auto_reconnect = auto_reconnect
         self._conn = TdxConnection(host, port, timeout)
 
+    # ------------------------------------------------------------------ #
+    # 工厂方法：自动优选最低延迟服务器
+    # ------------------------------------------------------------------ #
+
+    @classmethod
+    def from_best_host(
+        cls,
+        hosts: list[str] = KNOWN_HOSTS,
+        port: int = _DEFAULT_PORT,
+        timeout: float = 15.0,
+        ping_timeout: float = 5.0,
+        auto_reconnect: bool = True,
+    ) -> "TdxClient":
+        """测量 hosts 中所有服务器延迟，选最低延迟的建立连接。
+
+        若所有服务器均不可达，回退到 hosts[0]。
+        """
+        ranked = ping_all(hosts, port, ping_timeout)
+        best = ranked[0][0] if ranked else hosts[0]
+        return cls(best, port, timeout, auto_reconnect)
+
+    @staticmethod
+    def ping_all(
+        hosts: list[str] = KNOWN_HOSTS,
+        port: int = _DEFAULT_PORT,
+        timeout: float = 5.0,
+    ) -> list[tuple[str, float]]:
+        """测量多台服务器延迟，返回按延迟排序的 (host, seconds) 列表。"""
+        return ping_all(hosts, port, timeout)
+
+    # ------------------------------------------------------------------ #
+    # 连接管理
+    # ------------------------------------------------------------------ #
+
     def connect(self) -> None:
         self._conn.connect()
 
@@ -64,23 +111,40 @@ class TdxClient:
     ) -> None:
         self.close()
 
+    # ------------------------------------------------------------------ #
+    # 内部执行：含自动重连
+    # ------------------------------------------------------------------ #
+
+    def _execute(self, cmd: "BaseCommand[_T]") -> _T:
+        """执行命令；断线时尝试重连一次再重试（若 auto_reconnect=True）。"""
+        try:
+            return self._conn.execute(cmd)
+        except TdxConnectionError:
+            if not self._auto_reconnect:
+                raise
+            # 重连后重试一次
+            self._conn.close()
+            self._conn = TdxConnection(self._host, self._port, self._timeout)
+            self._conn.connect()
+            return self._conn.execute(cmd)
+
     # ------------------------------------------------------------------ #
     # 市场信息
     # ------------------------------------------------------------------ #
 
     def get_security_count(self, market: Market) -> int:
         """获取市场证券总数。"""
-        return self._conn.execute(GetSecurityCountCmd(market))
+        return self._execute(GetSecurityCountCmd(market))
 
     def get_security_list(self, market: Market, start: int) -> list[SecurityInfo]:
         """获取证券列表（每页约1000条，按 start 分页）。"""
-        return self._conn.execute(GetSecurityListCmd(market, start))
+        return self._execute(GetSecurityListCmd(market, start))
 
     def get_security_quotes(
         self, stocks: list[tuple[Market, str]]
     ) -> list[SecurityQuote]:
         """批量获取实时五档行情（最多80只/次）。"""
-        return self._conn.execute(GetSecurityQuotesCmd(stocks))
+        return self._execute(GetSecurityQuotesCmd(stocks))
 
     # ------------------------------------------------------------------ #
     # K 线
@@ -95,7 +159,7 @@ class TdxClient:
         count: int = 800,
     ) -> list[SecurityBar]:
         """获取 K 线数据（最多800条/次，按 start 分页）。"""
-        return self._conn.execute(GetSecurityBarsCmd(market, code, category, start, count))
+        return self._execute(GetSecurityBarsCmd(market, code, category, start, count))
 
     def get_index_bars(
         self,
@@ -106,7 +170,7 @@ class TdxClient:
         count: int = 800,
     ) -> list[SecurityBar]:
         """获取指数 K 线数据。"""
-        return self._conn.execute(GetIndexBarsCmd(market, code, category, start, count))
+        return self._execute(GetIndexBarsCmd(market, code, category, start, count))
 
     # ------------------------------------------------------------------ #
     # 分时
@@ -114,13 +178,13 @@ class TdxClient:
 
     def get_minute_time_data(self, market: Market, code: str) -> list[MinuteBar]:
         """获取今日分时数据（240条）。"""
-        return self._conn.execute(GetMinuteTimeDataCmd(market, code))
+        return self._execute(GetMinuteTimeDataCmd(market, code))
 
     def get_history_minute_time_data(
         self, market: Market, code: str, date: int
     ) -> list[MinuteBar]:
         """获取历史某日分时数据（date: YYYYMMDD）。"""
-        return self._conn.execute(GetHistoryMinuteTimeDataCmd(market, code, date))
+        return self._execute(GetHistoryMinuteTimeDataCmd(market, code, date))
 
     # ------------------------------------------------------------------ #
     # 逐笔成交
@@ -130,13 +194,13 @@ class TdxClient:
         self, market: Market, code: str, start: int, count: int = 800
     ) -> list[TransactionRecord]:
         """获取当日逐笔成交（分页）。"""
-        return self._conn.execute(GetTransactionDataCmd(market, code, start, count))
+        return self._execute(GetTransactionDataCmd(market, code, start, count))
 
     def get_history_transaction_data(
         self, market: Market, code: str, date: int, start: int, count: int = 800
     ) -> list[TransactionRecord]:
         """获取历史逐笔成交（date: YYYYMMDD，分页）。"""
-        return self._conn.execute(
+        return self._execute(
             GetHistoryTransactionDataCmd(market, code, date, start, count)
         )
 
@@ -146,23 +210,23 @@ class TdxClient:
 
     def get_xdxr_info(self, market: Market, code: str) -> list[XdxrRecord]:
         """获取除权除息历史记录。"""
-        return self._conn.execute(GetXdxrInfoCmd(market, code))
+        return self._execute(GetXdxrInfoCmd(market, code))
 
     def get_finance_info(self, market: Market, code: str) -> FinanceInfo:
         """获取最新财务数据。"""
-        return self._conn.execute(GetFinanceInfoCmd(market, code))
+        return self._execute(GetFinanceInfoCmd(market, code))
 
     def get_company_info_category(
         self, market: Market, code: str
     ) -> list[CompanyInfoCategory]:
         """获取公司信息文件目录。"""
-        return self._conn.execute(GetCompanyInfoCategoryCmd(market, code))
+        return self._execute(GetCompanyInfoCategoryCmd(market, code))
 
     def get_company_info_content(
         self, market: Market, code: str, filename: str, offset: int, length: int
     ) -> str:
         """读取公司信息文本。"""
-        return self._conn.execute(
+        return self._execute(
             GetCompanyInfoContentCmd(market, code, filename, offset, length)
         )
 
@@ -183,7 +247,7 @@ class AsyncTdxClient:
 
     def __init__(
         self,
-        host: str = _DEFAULT_HOST,
+        host: str = KNOWN_HOSTS[0],
         port: int = _DEFAULT_PORT,
         timeout: float = 15.0,
     ) -> None:
diff --git a/src/xmtdx/commands/transaction.py b/src/xmtdx/commands/transaction.py
index 7fe960b..b356d52 100644
--- a/src/xmtdx/commands/transaction.py
+++ b/src/xmtdx/commands/transaction.py
@@ -28,7 +28,7 @@ class GetTransactionDataCmd(BaseCommand[list[TransactionRecord]]):
 
 
     def parse_response(self, body: bytes) -> list[TransactionRecord]:
-        return _parse_transaction_body(body, skip=2)
+        return _parse_transaction_body(body)
 
 
 class GetHistoryTransactionDataCmd(BaseCommand[list[TransactionRecord]]):
diff --git a/src/xmtdx/transport/sync.py b/src/xmtdx/transport/sync.py
index c432dc7..f4ba19e 100644
--- a/src/xmtdx/transport/sync.py
+++ b/src/xmtdx/transport/sync.py
@@ -1,6 +1,7 @@
 """同步 TCP 连接（基于 socket）。"""
 
 import socket
+import time
 from types import TracebackType
 from typing import TYPE_CHECKING, TypeVar
 
@@ -17,6 +18,81 @@ _DEFAULT_HOST = "180.153.18.170"
 _DEFAULT_PORT = 7709
 _DEFAULT_TIMEOUT = 15.0
 
+# 已知可用的通达信行情服务器（按优先级排序）
+KNOWN_HOSTS: list[str] = [
+    "180.153.18.170",
+    "180.153.18.171",
+    "180.153.18.172",
+    "115.238.56.198",
+    "115.238.90.165",
+    "218.75.126.9",
+    "47.107.75.159",
+    "59.175.238.38",
+]
+
+
+def ping_host(
+    host: str,
+    port: int = _DEFAULT_PORT,
+    timeout: float = 5.0,
+) -> float | None:
+    """测量连接到指定服务器并完成握手所需的时间（秒）。
+
+    返回延迟（秒），连接失败时返回 None。
+    """
+    t0 = time.monotonic()
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.settimeout(timeout)
+    try:
+        sock.connect((host, port))
+        # 发送第一条握手命令并等待响应作为可用性验证
+        sock.sendall(SETUP_COMMANDS[0])
+        hdr_buf = _recv_exact_sock(sock, HEADER_SIZE)
+        hdr = parse_header(hdr_buf)
+        if hdr.zipsize > 0:
+            _recv_exact_sock(sock, hdr.zipsize)
+        return time.monotonic() - t0
+    except OSError:
+        return None
+    finally:
+        try:
+            sock.close()
+        except OSError:
+            pass
+
+
+def ping_all(
+    hosts: list[str] = KNOWN_HOSTS,
+    port: int = _DEFAULT_PORT,
+    timeout: float = 5.0,
+) -> list[tuple[str, float]]:
+    """并发测量多台服务器延迟，返回按延迟排序的 (host, latency_seconds) 列表。
+
+    不可达的服务器不包含在结果中。
+    """
+    import concurrent.futures
+
+    results: list[tuple[str, float]] = []
+    with concurrent.futures.ThreadPoolExecutor(max_workers=len(hosts)) as pool:
+        futures = {pool.submit(ping_host, h, port, timeout): h for h in hosts}
+        for fut in concurrent.futures.as_completed(futures):
+            host = futures[fut]
+            latency = fut.result()
+            if latency is not None:
+                results.append((host, latency))
+    results.sort(key=lambda t: t[1])
+    return results
+
+
+def _recv_exact_sock(sock: socket.socket, n: int) -> bytes:
+    buf = bytearray()
+    while len(buf) < n:
+        chunk = sock.recv(n - len(buf))
+        if not chunk:
+            raise TdxConnectionError("连接被服务器关闭")
+        buf.extend(chunk)
+    return bytes(buf)
+
 
 class TdxConnection:
     """同步通达信 TCP 连接。
@@ -112,10 +188,4 @@ class TdxConnection:
     def _recv_exact(self, n: int) -> bytes:
         """循环 recv 直到读满 n 字节。"""
         assert self._sock is not None
-        buf = bytearray()
-        while len(buf) < n:
-            chunk = self._sock.recv(n - len(buf))
-            if not chunk:
-                raise TdxConnectionError("连接被服务器关闭")
-            buf.extend(chunk)
-        return bytes(buf)
+        return _recv_exact_sock(self._sock, n)
diff --git a/tests/fixtures/company_info_category.hex b/tests/fixtures/company_info_category.hex
new file mode 100644
index 0000000..dafdb8b
--- /dev/null
+++ b/tests/fixtures/company_info_category.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/company_info_category.json b/tests/fixtures/company_info_category.json
new file mode 100644
index 0000000..995910d
--- /dev/null
+++ b/tests/fixtures/company_info_category.json
@@ -0,0 +1,8 @@
+{
+  "num_records": 16,
+  "first": {
+    "filename": "600000.txt",
+    "start": 0,
+    "length": 11426
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/company_info_content.hex b/tests/fixtures/company_info_content.hex
new file mode 100644
index 0000000..524f62d
--- /dev/null
+++ b/tests/fixtures/company_info_content.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/company_info_content.json b/tests/fixtures/company_info_content.json
new file mode 100644
index 0000000..0fdcf62
--- /dev/null
+++ b/tests/fixtures/company_info_content.json
@@ -0,0 +1,4 @@
+{
+  "length": 8070,
+  "prefix": "☆最新提示☆ ◇600000 浦发银行 更新日期：2026-04-10◇ 港澳资讯 灵通V9.0\r\n"
+}
\ No newline at end of file
diff --git a/tests/fixtures/finance_info.hex b/tests/fixtures/finance_info.hex
new file mode 100644
index 0000000..1da9b08
--- /dev/null
+++ b/tests/fixtures/finance_info.hex
@@ -0,0 +1 @@
+0100013630303030305f484b4a10000100eb253501460a31015f484b4a00c0f5444aa42c4c86d6224d00000000000000005c8fc23fcf3a1650000000009138814ce8a30c4b400b1d4800000000c05ee54a643b004d79c4424eaee7254d948fe54c00000000907f4c4cf4f4934b6b36b34d48e26e4c000000000c9b4b4ca247404cbacc3e4c44566f4d3d0ab14100004041
\ No newline at end of file
diff --git a/tests/fixtures/finance_info.json b/tests/fixtures/finance_info.json
new file mode 100644
index 0000000..969ccc0
--- /dev/null
+++ b/tests/fixtures/finance_info.json
@@ -0,0 +1,5 @@
+{
+  "liutong_guben": 33305837500.0,
+  "zong_guben": 33305837500.0,
+  "meigujing_zichan": 22.1299991607666
+}
\ No newline at end of file
diff --git a/tests/fixtures/history_minute_time.hex b/tests/fixtures/history_minute_time.hex
new file mode 100644
index 0000000..44bdbca
--- /dev/null
+++ b/tests/fixtures/history_minute_time.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/history_minute_time.json b/tests/fixtures/history_minute_time.json
new file mode 100644
index 0000000..5135622
--- /dev/null
+++ b/tests/fixtures/history_minute_time.json
@@ -0,0 +1,7 @@
+{
+  "num_records": 240,
+  "first": {
+    "price": 10.29,
+    "vol": 10044
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/history_transaction.hex b/tests/fixtures/history_transaction.hex
new file mode 100644
index 0000000..98bec15
--- /dev/null
+++ b/tests/fixtures/history_transaction.hex
@@ -0,0 +1 @@
+0a00ec512441800386103200008003411301008003009d0401008003003001008003009d02010080034183020100800301b50202008003411e0100810300170100840302a07b0200
\ No newline at end of file
diff --git a/tests/fixtures/history_transaction.json b/tests/fixtures/history_transaction.json
new file mode 100644
index 0000000..3eae59f
--- /dev/null
+++ b/tests/fixtures/history_transaction.json
@@ -0,0 +1,9 @@
+{
+  "num_records": 10,
+  "first": {
+    "hour": 14,
+    "minute": 56,
+    "price": 10.3,
+    "vol": 50
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/minute_time.hex b/tests/fixtures/minute_time.hex
new file mode 100644
index 0000000..a8f5302
--- /dev/null
+++ b/tests/fixtures/minute_time.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/minute_time.json b/tests/fixtures/minute_time.json
new file mode 100644
index 0000000..837d7d6
--- /dev/null
+++ b/tests/fixtures/minute_time.json
@@ -0,0 +1,8 @@
+{
+  "num_records": 240,
+  "first": {
+    "price": 0.01,
+    "vol": 48,
+    "unknown_1": 54
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/security_bars.hex b/tests/fixtures/security_bars.hex
new file mode 100644
index 0000000..2233889
--- /dev/null
+++ b/tests/fixtures/security_bars.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/security_bars.json b/tests/fixtures/security_bars.json
new file mode 100644
index 0000000..4a5eb15
--- /dev/null
+++ b/tests/fixtures/security_bars.json
@@ -0,0 +1,10 @@
+{
+  "num_records": 5,
+  "first": {
+    "open": 10.25,
+    "high": 10.25,
+    "low": 10.08,
+    "close": 10.12,
+    "vol": 41151820.0
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/security_count.hex b/tests/fixtures/security_count.hex
new file mode 100644
index 0000000..47ab6f6
--- /dev/null
+++ b/tests/fixtures/security_count.hex
@@ -0,0 +1 @@
+0569
\ No newline at end of file
diff --git a/tests/fixtures/security_count.json b/tests/fixtures/security_count.json
new file mode 100644
index 0000000..23d5b03
--- /dev/null
+++ b/tests/fixtures/security_count.json
@@ -0,0 +1,3 @@
+{
+  "count": 26885
+}
\ No newline at end of file
diff --git a/tests/fixtures/security_list.hex b/tests/fixtures/security_list.hex
new file mode 100644
index 0000000..389b996
--- /dev/null
+++ b/tests/fixtures/security_list.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/security_list.json b/tests/fixtures/security_list.json
new file mode 100644
index 0000000..7bd0181
--- /dev/null
+++ b/tests/fixtures/security_list.json
@@ -0,0 +1,8 @@
+{
+  "num_records": 1000,
+  "first": {
+    "code": "999999",
+    "name": "上证指数",
+    "pre_close": 11654847.33
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/security_quotes.hex b/tests/fixtures/security_quotes.hex
new file mode 100644
index 0000000..c9315fc
--- /dev/null
+++ b/tests/fixtures/security_quotes.hex
@@ -0,0 +1 @@
+01050100013630303030303e109d0f04040643acfaa60edd0f9889349483013a6ec94da7831cb2851841a6e2020001bd0788124102a8cd0187314203906aab114304a7b4018f1f4405ab96019812560f0000000000003e10
\ No newline at end of file
diff --git a/tests/fixtures/security_quotes.json b/tests/fixtures/security_quotes.json
new file mode 100644
index 0000000..bc801a9
--- /dev/null
+++ b/tests/fixtures/security_quotes.json
@@ -0,0 +1,9 @@
+{
+  "num_records": 1,
+  "first": {
+    "code": "600000",
+    "pre_close": 9.93,
+    "unknown_2": -1,
+    "unknown_3": 22694
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/transaction.hex b/tests/fixtures/transaction.hex
new file mode 100644
index 0000000..b6f929d
--- /dev/null
+++ b/tests/fixtures/transaction.hex
@@ -0,0 +1 @@
+0a0083039e0f0000080083030000000800830300000008008303000000080083030000000800830300000008008303410000080083030000000800830300000008008403009483019f040200
\ No newline at end of file
diff --git a/tests/fixtures/transaction.json b/tests/fixtures/transaction.json
new file mode 100644
index 0000000..c90a1de
--- /dev/null
+++ b/tests/fixtures/transaction.json
@@ -0,0 +1,9 @@
+{
+  "num_records": 10,
+  "first": {
+    "hour": 14,
+    "minute": 59,
+    "price": 9.9,
+    "vol": 0
+  }
+}
\ No newline at end of file
diff --git a/tests/fixtures/xdxr_info.hex b/tests/fixtures/xdxr_info.hex
new file mode 100644
index 0000000..10a35d8
--- /dev/null
+++ b/tests/fixtures/xdxr_info.hex
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/tests/fixtures/xdxr_info.json b/tests/fixtures/xdxr_info.json
new file mode 100644
index 0000000..f5bfa9d
--- /dev/null
+++ b/tests/fixtures/xdxr_info.json
@@ -0,0 +1,9 @@
+{
+  "num_records": 87,
+  "first": {
+    "year": 1999,
+    "month": 11,
+    "day": 10,
+    "category": 5
+  }
+}
\ No newline at end of file
diff --git a/tests/unit/test_commands_offline.py b/tests/unit/test_commands_offline.py
new file mode 100644
index 0000000..bfe4aa6
--- /dev/null
+++ b/tests/unit/test_commands_offline.py
@@ -0,0 +1,328 @@
+"""离线 fixture 测试：将录制的原始 body 字节喂给各命令 parse_response，验证解析结果。
+
+fixtures/ 目录下每个 .hex 文件是一次真实服务器响应的 body（已解压），
+对应的 .json 文件记录关键预期值，供手工核对。
+此测试文件直接断言解析结果，无需网络连接。
+"""
+from __future__ import annotations
+
+import pathlib
+import pytest
+
+FIXTURES = pathlib.Path(__file__).parent.parent / "fixtures"
+
+
+def load_hex(name: str) -> bytes:
+    return bytes.fromhex((FIXTURES / f"{name}.hex").read_text().strip())
+
+
+# ---------------------------------------------------------------------------
+# security_count
+# ---------------------------------------------------------------------------
+
+def test_security_count_parse():
+    from xmtdx.commands.security_count import GetSecurityCountCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("security_count")
+    cmd = GetSecurityCountCmd(Market.SH)
+    count = cmd.parse_response(body)
+
+    assert isinstance(count, int)
+    assert count > 0
+    # 体积固定为 2 字节，结果与录制时完全一致
+    assert count == 26885
+
+
+# ---------------------------------------------------------------------------
+# security_list
+# ---------------------------------------------------------------------------
+
+def test_security_list_parse():
+    from xmtdx.commands.security_list import GetSecurityListCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("security_list")
+    cmd = GetSecurityListCmd(Market.SH, 0)
+    records = cmd.parse_response(body)
+
+    assert len(records) == 1000
+
+    r0 = records[0]
+    assert r0.code == "999999"
+    assert r0.name == "上证指数"
+    # pre_close is a float; the index level is stored ×100 and has many decimal places
+    assert abs(r0.pre_close - 11654847.33) < 1.0
+
+    # _raw present and non-empty for every record
+    assert all(len(r._raw) > 0 for r in records)
+
+
+def test_security_list_gbk_no_crash():
+    """Bug #2 修复验证：GBK 解码不崩溃，所有记录均有 code。"""
+    from xmtdx.commands.security_list import GetSecurityListCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("security_list")
+    cmd = GetSecurityListCmd(Market.SH, 0)
+    records = cmd.parse_response(body)
+    assert all(r.code for r in records)
+
+
+# ---------------------------------------------------------------------------
+# security_bars
+# ---------------------------------------------------------------------------
+
+def test_security_bars_parse():
+    from xmtdx.commands.security_bars import GetSecurityBarsCmd
+    from xmtdx.models.enums import Market, KlineCategory
+
+    body = load_hex("security_bars")
+    cmd = GetSecurityBarsCmd(Market.SH, "600000", KlineCategory.DAY, 0, 5)
+    bars = cmd.parse_response(body)
+
+    assert len(bars) == 5
+
+    b0 = bars[0]
+    assert abs(b0.open - 10.25) < 0.01
+    assert abs(b0.high - 10.25) < 0.01
+    assert abs(b0.low - 10.08) < 0.01
+    assert abs(b0.close - 10.12) < 0.01
+    assert b0.vol > 0
+
+    # OHLC sanity: high ≥ open,close,low; low ≤ open,close
+    for bar in bars:
+        assert bar.high >= bar.open - 0.001
+        assert bar.high >= bar.close - 0.001
+        assert bar.low <= bar.open + 0.001
+        assert bar.low <= bar.close + 0.001
+        assert bar.vol > 0
+        assert len(bar._raw) > 0
+
+
+# ---------------------------------------------------------------------------
+# security_quotes
+# ---------------------------------------------------------------------------
+
+def test_security_quotes_parse():
+    from xmtdx.commands.security_quotes import GetSecurityQuotesCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("security_quotes")
+    cmd = GetSecurityQuotesCmd([(Market.SH, "600000")])
+    quotes = cmd.parse_response(body)
+
+    assert len(quotes) == 1
+
+    q = quotes[0]
+    assert q.code == "600000"
+    assert abs(q.pre_close - 9.93) < 0.01
+
+    # unknown fields are captured (not discarded)
+    assert hasattr(q, "unknown_2")
+    assert hasattr(q, "unknown_3")
+    assert hasattr(q, "unknown_5")
+    assert hasattr(q, "unknown_6")
+    assert hasattr(q, "unknown_7")
+    assert hasattr(q, "unknown_8")
+    assert hasattr(q, "rise_speed")
+    assert len(q._raw) > 0
+
+    # fixed values from frozen fixture
+    assert q.unknown_2 == -1
+    assert q.unknown_3 == 22694
+
+
+# ---------------------------------------------------------------------------
+# minute_time
+# ---------------------------------------------------------------------------
+
+def test_minute_time_parse():
+    from xmtdx.commands.minute_time import GetMinuteTimeDataCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("minute_time")
+    cmd = GetMinuteTimeDataCmd(Market.SH, "600000")
+    bars = cmd.parse_response(body)
+
+    assert len(bars) == 240
+
+    b0 = bars[0]
+    assert isinstance(b0.price, float)
+    assert isinstance(b0.vol, int)
+    # Bug #5 fix: unknown_1 is preserved, not discarded
+    assert hasattr(b0, "unknown_1")
+    assert isinstance(b0.unknown_1, int)
+    assert len(b0._raw) > 0
+
+    # fixed values
+    assert abs(b0.price - 0.01) < 0.001
+    assert b0.vol == 48
+    assert b0.unknown_1 == 54
+
+
+# ---------------------------------------------------------------------------
+# history_minute_time
+# ---------------------------------------------------------------------------
+
+def test_history_minute_time_parse():
+    from xmtdx.commands.minute_time import GetHistoryMinuteTimeDataCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("history_minute_time")
+    cmd = GetHistoryMinuteTimeDataCmd(Market.SH, "600000", 20250108)
+    bars = cmd.parse_response(body)
+
+    assert len(bars) == 240
+
+    b0 = bars[0]
+    assert abs(b0.price - 10.29) < 0.01
+    assert b0.vol == 10044
+    assert hasattr(b0, "unknown_1")
+    assert len(b0._raw) > 0
+
+
+# ---------------------------------------------------------------------------
+# transaction (current day)
+# ---------------------------------------------------------------------------
+
+def test_transaction_parse():
+    from xmtdx.commands.transaction import GetTransactionDataCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("transaction")
+    cmd = GetTransactionDataCmd(Market.SH, "600000", 0, 10)
+    recs = cmd.parse_response(body)
+
+    assert len(recs) == 10
+
+    r0 = recs[0]
+    assert r0.hour == 14
+    assert r0.minute == 59
+    assert abs(r0.price - 9.9) < 0.01
+    assert r0.vol == 0
+
+    # Bug #4 fix: unknown_last captured
+    assert hasattr(r0, "unknown_last")
+    assert len(r0._raw) > 0
+
+    # buyorsell: 0=buy, 1=sell, 2=neutral, 8=auction — field is an int
+    for r in recs:
+        assert isinstance(r.buyorsell, int)
+
+
+# ---------------------------------------------------------------------------
+# history_transaction
+# ---------------------------------------------------------------------------
+
+def test_history_transaction_parse():
+    from xmtdx.commands.transaction import GetHistoryTransactionDataCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("history_transaction")
+    cmd = GetHistoryTransactionDataCmd(Market.SH, "600000", 20250108, 0, 10)
+    recs = cmd.parse_response(body)
+
+    assert len(recs) == 10
+
+    r0 = recs[0]
+    assert r0.hour == 14
+    assert r0.minute == 56
+    assert abs(r0.price - 10.3) < 0.01
+    assert r0.vol == 50
+
+    assert hasattr(r0, "unknown_last")
+    assert len(r0._raw) > 0
+
+    for r in recs:
+        assert isinstance(r.buyorsell, int)
+
+
+# ---------------------------------------------------------------------------
+# xdxr_info
+# ---------------------------------------------------------------------------
+
+def test_xdxr_info_parse():
+    from xmtdx.commands.xdxr_info import GetXdxrInfoCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("xdxr_info")
+    cmd = GetXdxrInfoCmd(Market.SH, "600000")
+    recs = cmd.parse_response(body)
+
+    assert len(recs) == 87
+
+    r0 = recs[0]
+    assert r0.year == 1999
+    assert r0.month == 11
+    assert r0.day == 10
+    assert r0.category == 5
+
+    # Bug #1 fix: each record has a unique date (not all reading from body[:7])
+    dates = {(r.year, r.month, r.day) for r in recs}
+    assert len(dates) > 1, "All records have the same date — Bug #1 not fixed!"
+
+    assert all(len(r._raw) > 0 for r in recs)
+
+
+# ---------------------------------------------------------------------------
+# finance_info
+# ---------------------------------------------------------------------------
+
+def test_finance_info_parse():
+    from xmtdx.commands.finance_info import GetFinanceInfoCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("finance_info")
+    cmd = GetFinanceInfoCmd(Market.SH, "600000")
+    info = cmd.parse_response(body)
+
+    # Check key fields are present and reasonable
+    assert info.liutong_guben > 0
+    assert info.zong_guben > 0
+    assert info.meigujing_zichan > 0
+
+    # Fixed values from frozen fixture
+    assert abs(info.liutong_guben - 33305837500.0) < 1e6
+    assert abs(info.zong_guben - 33305837500.0) < 1e6
+    assert abs(info.meigujing_zichan - 22.13) < 0.1
+
+    assert len(info._raw) > 0
+
+
+# ---------------------------------------------------------------------------
+# company_info_category
+# ---------------------------------------------------------------------------
+
+def test_company_info_category_parse():
+    from xmtdx.commands.company_info import GetCompanyInfoCategoryCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("company_info_category")
+    cmd = GetCompanyInfoCategoryCmd(Market.SH, "600000")
+    cats = cmd.parse_response(body)
+
+    assert len(cats) == 16
+
+    c0 = cats[0]
+    assert c0.filename == "600000.txt"
+    assert c0.start == 0
+    assert c0.length == 11426
+
+
+# ---------------------------------------------------------------------------
+# company_info_content
+# ---------------------------------------------------------------------------
+
+def test_company_info_content_parse():
+    from xmtdx.commands.company_info import GetCompanyInfoContentCmd
+    from xmtdx.models.enums import Market
+
+    body = load_hex("company_info_content")
+    cmd = GetCompanyInfoContentCmd(Market.SH, "600000", "600000.txt", 0, 11426)
+    text = cmd.parse_response(body)
+
+    assert isinstance(text, str)
+    assert len(text) == 8070
+    assert "600000" in text
+    assert "浦发银行" in text