diff --git a/frontend/src/pages/backtest/MiningWorkbench.tsx b/frontend/src/pages/backtest/MiningWorkbench.tsx
index 9a61a3c..a270f2b 100644
--- a/frontend/src/pages/backtest/MiningWorkbench.tsx
+++ b/frontend/src/pages/backtest/MiningWorkbench.tsx
@@ -58,6 +58,23 @@ const PROFILE_LABELS: Record<MiningBudgetProfile, string> = {
   balanced: '均衡档',
   strict: '严格档',
 }
+// 市场环境覆盖不足的失败文案 (regime_alignment 校验抛出), 命中时弹「补算并重跑」确认。
+const REGIME_COVERAGE_ERROR_RE = /市场环境数据覆盖不完整|市场环境数据为空/
+const REGIME_FIRST_MISSING_RE = /缺少前一交易日环境\s*(\d{4}-\d{2}-\d{2})/
+
+/** run.request 带 auto/auto_screening 附加字段, 而 start 接口 extra="forbid", 重跑前剥回纯 MiningRequestV1。 */
+function stripMiningRequestExtras(request: MiningRun['request']): MiningRequestV1 {
+  const {
+    factor_names, strategy_ids, symbols, asset_type, start, end, budget_profile,
+    commission_pct, stamp_tax_pct, slippage_bps, correlation_threshold,
+    max_combination_factors, beam_width, max_finalists, force,
+  } = request
+  return {
+    factor_names, strategy_ids, symbols, asset_type, start, end, budget_profile,
+    commission_pct, stamp_tax_pct, slippage_bps, correlation_threshold,
+    max_combination_factors, beam_width, max_finalists, force,
+  }
+}
 
 interface MiningDraft {
   assetType: 'stock' | 'etf'
@@ -606,6 +623,43 @@ export function MiningWorkbench() {
     onError: error => toast(`保存失败 · ${String((error as Error).message || error)}`, 'error'),
   })
 
+  // 市场环境覆盖不足: 挖矿内部 T-1 环境校验 (fail-closed) 失败时弹「补算并重跑」确认。
+  // 确定 → 调 regime/recompute 补算缺失区间后自动重跑同一 payload; 取消 → 仅关闭不动作。
+  const [regimeBackfill, setRegimeBackfill] = useState<{ payload: MiningRequestV1; start?: string } | null>(null)
+  const regimeErrorHandled = useRef('')
+  useEffect(() => {
+    if (task.isPending) {
+      regimeErrorHandled.current = ''
+      return
+    }
+    if (!task.error || !REGIME_COVERAGE_ERROR_RE.test(task.error)) return
+    if (regimeErrorHandled.current === task.error) return
+    const request = task.run?.request
+    if (!request) return
+    regimeErrorHandled.current = task.error
+    setRegimeBackfill({
+      payload: stripMiningRequestExtras(request),
+      start: REGIME_FIRST_MISSING_RE.exec(task.error)?.[1],
+    })
+  }, [task.error, task.isPending, task.run])
+  const regimeRecomputeAndRun = useMutation({
+    mutationFn: async (job: { payload: MiningRequestV1; start?: string }) => {
+      // start 缺省(环境数据为空)时后端从 enriched 最早日全量重算; 有 start 则只补缺口区间
+      const recomputed = await api.regimeRecompute(job.start)
+      return { recomputed, job }
+    },
+    onSuccess: ({ recomputed, job }) => {
+      for (const key of [QK.regimeLatest, QK.regimeCoverage, QK.regimeHistory()]) {
+        queryClient.invalidateQueries({ queryKey: key })
+      }
+      toast(recomputed.computed > 0 ? `环境补算完成 · 新增 ${recomputed.computed} 天，重新开始挖掘` : '环境数据已是最新，重新开始挖掘', 'success')
+      setRegimeBackfill(null)
+      submitMining(job.payload)
+    },
+    onError: error => toast(`环境补算失败 · ${String((error as Error).message || error)}`, 'error'),
+  })
+  const regimeBackdrop = useDialogBackdrop(() => setRegimeBackfill(null), () => !regimeRecomputeAndRun.isPending)
+
   const attachRun = (run: MiningRun) => {
     const params = new URLSearchParams(searchParams)
     params.set('run', run.run_id)
@@ -814,6 +868,30 @@ export function MiningWorkbench() {
           </div>
         </div>
       )}
+
+      {/* 市场环境覆盖不足的补救确认: 补算缺失区间后自动重跑, 取消则不做任何操作。 */}
+      {regimeBackfill && (
+        <div {...regimeBackdrop} className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 p-4">
+          <div onClick={e => e.stopPropagation()} className="w-full max-w-sm rounded-2xl border border-border bg-surface p-5 shadow-2xl">
+            <div className="flex items-center gap-2 text-sm font-semibold text-foreground">
+              <Database className="h-4 w-4 shrink-0 text-warning" />
+              市场环境数据不完整
+            </div>
+            <p className="mt-2 text-xs leading-5 text-secondary">
+              {regimeBackfill.start
+                ? <>环境数据缺少 <span className="font-mono text-foreground">{regimeBackfill.start}</span> 起的部分交易日，挖掘的 T-1 环境校验未通过。点击确定将自动补算该区间（结束至今日），完成后重新开始挖掘。</>
+                : '尚未计算市场环境数据。点击确定将执行全量计算（历史较长时耗时较久），完成后重新开始挖掘。'}
+            </p>
+            <div className="mt-4 flex justify-end gap-2">
+              <button type="button" disabled={regimeRecomputeAndRun.isPending} onClick={() => setRegimeBackfill(null)} className="h-8 rounded-btn border border-border px-3 text-xs text-secondary hover:bg-elevated disabled:opacity-50">取消</button>
+              <button type="button" disabled={regimeRecomputeAndRun.isPending} onClick={() => regimeRecomputeAndRun.mutate(regimeBackfill)} className="inline-flex h-8 items-center gap-1.5 rounded-btn bg-accent px-3 text-xs font-semibold text-white hover:opacity-90 disabled:opacity-50">
+                {regimeRecomputeAndRun.isPending ? <LoaderCircle className="h-3.5 w-3.5 animate-spin" /> : <Database className="h-3.5 w-3.5" />}
+                补算并重新挖掘
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   )
 }