diff --git a/backend/app/services/webhook_adapter.py b/backend/app/services/webhook_adapter.py
index 8d6fa7b..ca21139 100644
--- a/backend/app/services/webhook_adapter.py
+++ b/backend/app/services/webhook_adapter.py
@@ -141,10 +141,10 @@ def _post_feishu(webhook_url: str, payload: dict, secret: str, max_attempts: int
         except Exception as e:  # noqa: BLE001 — 网络/超时, 可重试
             last_err = str(e)
 
-        if attempt < _FEISHU_MAX_ATTEMPTS:
+        if attempt < max_attempts:
             time.sleep(min(2 ** (attempt - 1), 3))  # 退避: 1s, 2s
 
-    logger.warning("飞书 Webhook 推送最终失败(已重试 %d 次): %s", _FEISHU_MAX_ATTEMPTS, last_err)
+    logger.warning("飞书 Webhook 推送最终失败(已重试 %d 次): %s", max_attempts, last_err)
     return False
 
 
diff --git a/backend/tests/test_notification_adapters.py b/backend/tests/test_notification_adapters.py
index 7f08507..44e0ba4 100644
--- a/backend/tests/test_notification_adapters.py
+++ b/backend/tests/test_notification_adapters.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 import hashlib
 import hmac
 import json
+import logging
 
 from app.services import email_adapter, webhook_adapter
 
@@ -98,3 +99,42 @@ def test_email_adapter_uses_starttls_login_and_multiple_recipients(monkeypatch):
     assert message["To"] == "one@example.com, two@example.com"
     assert message["Subject"] == "监控告警"
     assert smtp.calls[-1] == ("quit",)
+
+
+def _unreachable(*_args, **_kwargs):
+    raise ConnectionError("unreachable")
+
+
+def test_feishu_single_attempt_returns_without_backoff_and_logs_the_real_count(monkeypatch, caplog):
+    # 设置页「发送测试消息」传 max_attempts=1: 失败即返回, 不等退避, 日志计数如实。
+    sleeps: list[float] = []
+    monkeypatch.setattr(webhook_adapter.time, "sleep", lambda seconds: sleeps.append(seconds))
+    monkeypatch.setattr("httpx.post", _unreachable)
+    with caplog.at_level(logging.WARNING, logger=webhook_adapter.__name__):
+        ok = webhook_adapter.send_feishu(
+            "https://open.feishu.cn/open-apis/bot/v2/hook/abc", "标题", "正文", max_attempts=1
+        )
+    assert ok is False
+    assert sleeps == []
+    assert "已重试 1 次" in caplog.text
+
+
+def test_feishu_production_retries_keep_backoff(monkeypatch, caplog):
+    # 生产路径 (默认 3 次) 的退避与日志不变: 1s、2s 两次退避, 日志写 3 次。
+    sleeps: list[float] = []
+    calls = {"n": 0}
+
+    def unreachable(*_args, **_kwargs):
+        calls["n"] += 1
+        raise ConnectionError("unreachable")
+
+    monkeypatch.setattr(webhook_adapter.time, "sleep", lambda seconds: sleeps.append(seconds))
+    monkeypatch.setattr("httpx.post", unreachable)
+    with caplog.at_level(logging.WARNING, logger=webhook_adapter.__name__):
+        ok = webhook_adapter.send_feishu(
+            "https://open.feishu.cn/open-apis/bot/v2/hook/abc", "标题", "正文"
+        )
+    assert ok is False
+    assert calls["n"] == 3
+    assert sleeps == [1, 2]
+    assert "已重试 3 次" in caplog.text