diff --git a/.env.example b/.env.example
index 8cc0f09b..f3cac27e 100644
--- a/.env.example
+++ b/.env.example
@@ -56,6 +56,10 @@ METAR_CACHE_TTL_SEC=600
 JMA_AMEDAS_CACHE_TTL_SEC=120
 METEOBLUE_CACHE_TTL_SEC=7200
 POLYWEATHER_PROBABILITY_ENGINE=emos_primary
+POLYWEATHER_EMOS_AUTO_MIN_SAMPLES=50
+POLYWEATHER_EMOS_AUTO_MAX_DELTA_CRPS=0
+POLYWEATHER_EMOS_AUTO_MAX_DELTA_MAE=0.05
+POLYWEATHER_EMOS_AUTO_MIN_DELTA_BUCKET_HIT_RATE=-0.05
 POLYWEATHER_LGBM_ENABLED=false
 POLYWEATHER_LGBM_MODEL_PATH=/app/artifacts/models/lgbm_daily_high.txt
 POLYWEATHER_LGBM_SCHEMA_PATH=/app/artifacts/models/lgbm_daily_high_schema.json
diff --git a/.gitignore b/.gitignore
index 8be5333a..7f0beb9b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,8 @@ data/historical/
 data/cache/
 data/models/
 logs/
+artifacts/probability_calibration/auto_retrain_report.json
+artifacts/probability_calibration/candidates/
 
 # Python
 __pycache__/
diff --git a/docs/EMOS_TRAINING_REPORT_ZH.md b/docs/EMOS_TRAINING_REPORT_ZH.md
index ce3aac1d..81367248 100644
--- a/docs/EMOS_TRAINING_REPORT_ZH.md
+++ b/docs/EMOS_TRAINING_REPORT_ZH.md
@@ -99,7 +99,66 @@ POLYWEATHER_PROBABILITY_ENGINE=legacy
 
 如果连续回归显示 EMOS 退化，应先切回 `emos_shadow`，保留 shadow 观测，再决定是否回退到 `legacy`。
 
-## 8. 已验证
+## 8. 自动重训
+
+已新增自动重训编排脚本：
+
+```text
+python scripts\auto_retrain_probability_calibration.py
+```
+
+默认行为：
+
+- 生成一个新的 EMOS candidate。
+- 对 candidate 跑离线评估。
+- 写入候选目录和门禁报告。
+- 不覆盖线上 [default.json](/E:/web/PolyWeather/artifacts/probability_calibration/default.json)。
+
+候选产物默认写入：
+
+```text
+artifacts/probability_calibration/candidates/<version>/
+```
+
+允许门禁通过后自动发布：
+
+```text
+python scripts\auto_retrain_probability_calibration.py --promote-if-passed --run-tests
+```
+
+门禁默认阈值：
+
+- `POLYWEATHER_EMOS_AUTO_MIN_SAMPLES=50`
+- `POLYWEATHER_EMOS_AUTO_MAX_DELTA_CRPS=0`
+- `POLYWEATHER_EMOS_AUTO_MAX_DELTA_MAE=0.05`
+- `POLYWEATHER_EMOS_AUTO_MIN_DELTA_BUCKET_HIT_RATE=-0.05`
+
+说明：
+
+- `CRPS` 不允许比 legacy 更差。
+- `MAE` 最多允许轻微退化 `0.05`。
+- `bucket_hit_rate` 只做软门槛，因为它对结算边界过于敏感。
+- 如果发布，会先备份旧版 `default.json`。
+
+Docker 手动触发：
+
+```text
+docker compose exec -T polyweather_web python scripts/auto_retrain_probability_calibration.py
+```
+
+Docker 允许门禁发布：
+
+```text
+docker compose exec -T polyweather_web python scripts/auto_retrain_probability_calibration.py --promote-if-passed --run-tests
+```
+
+建议后续挂到宿主机 `cron` 或 systemd timer：
+
+```text
+0 3 * * * cd /root/PolyWeather && docker compose exec -T polyweather_web python scripts/auto_retrain_probability_calibration.py --promote-if-passed --run-tests
+```
+
+## 9. 已验证
 
 本次上线前已执行：
 
diff --git a/scripts/auto_retrain_probability_calibration.py b/scripts/auto_retrain_probability_calibration.py
new file mode 100644
index 00000000..df273365
--- /dev/null
+++ b/scripts/auto_retrain_probability_calibration.py
@@ -0,0 +1,311 @@
+import argparse
+import json
+import os
+import shutil
+import subprocess
+import sys
+from datetime import datetime, timezone
+from typing import Any, Dict, List, Optional
+
+PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+if PROJECT_ROOT not in sys.path:
+    sys.path.insert(0, PROJECT_ROOT)
+
+from src.analysis.probability_calibration import DEFAULT_CALIBRATION_FILE  # noqa: E402
+
+
+ARTIFACT_DIR = os.path.join(PROJECT_ROOT, "artifacts", "probability_calibration")
+DEFAULT_CANDIDATE_ROOT = os.path.join(ARTIFACT_DIR, "candidates")
+DEFAULT_DECISION_REPORT = os.path.join(ARTIFACT_DIR, "auto_retrain_report.json")
+
+
+def _sf(value: Any) -> Optional[float]:
+    if value is None:
+        return None
+    try:
+        return float(value)
+    except Exception:
+        return None
+
+
+def _env_float(name: str, default: float) -> float:
+    value = _sf(os.getenv(name))
+    return value if value is not None else default
+
+
+def _env_int(name: str, default: int) -> int:
+    value = _sf(os.getenv(name))
+    return int(value) if value is not None else default
+
+
+def _load_json(path: str) -> Dict[str, Any]:
+    try:
+        with open(path, "r", encoding="utf-8") as fh:
+            data = json.load(fh)
+        return data if isinstance(data, dict) else {}
+    except Exception:
+        return {}
+
+
+def _write_json(path: str, payload: Dict[str, Any]) -> None:
+    output_dir = os.path.dirname(os.path.abspath(path))
+    if output_dir:
+        os.makedirs(output_dir, exist_ok=True)
+    with open(path, "w", encoding="utf-8") as fh:
+        json.dump(payload, fh, ensure_ascii=False, indent=2)
+
+
+def _run_python(args: List[str]) -> Dict[str, Any]:
+    command = [sys.executable, *args]
+    completed = subprocess.run(
+        command,
+        cwd=PROJECT_ROOT,
+        text=True,
+        capture_output=True,
+        check=False,
+    )
+    return {
+        "command": command,
+        "returncode": completed.returncode,
+        "stdout": completed.stdout,
+        "stderr": completed.stderr,
+    }
+
+
+def _append_blocker(blockers: List[str], condition: bool, message: str) -> None:
+    if condition:
+        blockers.append(message)
+
+
+def judge_candidate(
+    evaluation_report: Dict[str, Any],
+    *,
+    min_samples: int,
+    max_delta_crps: float,
+    max_delta_mae: float,
+    min_delta_bucket_hit_rate: float,
+) -> Dict[str, Any]:
+    summary = evaluation_report.get("summary") or {}
+    delta = summary.get("delta") or {}
+    sample_count = int(summary.get("sample_count") or 0)
+    delta_crps = _sf(delta.get("crps"))
+    delta_mae = _sf(delta.get("mae"))
+    delta_hit = _sf(delta.get("bucket_hit_rate"))
+
+    blockers: List[str] = []
+    _append_blocker(
+        blockers,
+        sample_count < min_samples,
+        f"sample_count {sample_count} < {min_samples}",
+    )
+    _append_blocker(
+        blockers,
+        delta_crps is None or delta_crps > max_delta_crps,
+        f"delta_crps {delta_crps} > {max_delta_crps}",
+    )
+    _append_blocker(
+        blockers,
+        delta_mae is None or delta_mae > max_delta_mae,
+        f"delta_mae {delta_mae} > {max_delta_mae}",
+    )
+    _append_blocker(
+        blockers,
+        delta_hit is None or delta_hit < min_delta_bucket_hit_rate,
+        f"delta_bucket_hit_rate {delta_hit} < {min_delta_bucket_hit_rate}",
+    )
+
+    return {
+        "decision": "promote" if not blockers else "hold",
+        "ready_for_promotion": not blockers,
+        "blocking_reasons": blockers,
+        "thresholds": {
+            "min_samples": min_samples,
+            "max_delta_crps": max_delta_crps,
+            "max_delta_mae": max_delta_mae,
+            "min_delta_bucket_hit_rate": min_delta_bucket_hit_rate,
+        },
+        "metrics": {
+            "sample_count": sample_count,
+            "delta_crps": delta_crps,
+            "delta_mae": delta_mae,
+            "delta_bucket_hit_rate": delta_hit,
+        },
+    }
+
+
+def _promote(candidate_path: str, target_path: str) -> str:
+    target_dir = os.path.dirname(os.path.abspath(target_path))
+    if target_dir:
+        os.makedirs(target_dir, exist_ok=True)
+    backup_path = os.path.join(
+        target_dir,
+        "default.backup-{ts}.json".format(
+            ts=datetime.now(timezone.utc).strftime("%Y%m%d%H%M%S")
+        ),
+    )
+    if os.path.exists(target_path):
+        shutil.copy2(target_path, backup_path)
+    shutil.copy2(candidate_path, target_path)
+    return backup_path
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(
+        description="Train an EMOS candidate, evaluate it, and optionally promote it behind gates."
+    )
+    parser.add_argument("--candidate-root", default=DEFAULT_CANDIDATE_ROOT)
+    parser.add_argument("--target", default=DEFAULT_CALIBRATION_FILE)
+    parser.add_argument("--decision-output", default=DEFAULT_DECISION_REPORT)
+    parser.add_argument(
+        "--promote-if-passed",
+        action="store_true",
+        help="Copy the candidate over the active calibration file only if gates pass.",
+    )
+    parser.add_argument(
+        "--run-tests",
+        action="store_true",
+        help="Run focused probability tests before promotion.",
+    )
+    parser.add_argument(
+        "--min-samples",
+        type=int,
+        default=_env_int("POLYWEATHER_EMOS_AUTO_MIN_SAMPLES", 50),
+    )
+    parser.add_argument(
+        "--max-delta-crps",
+        type=float,
+        default=_env_float("POLYWEATHER_EMOS_AUTO_MAX_DELTA_CRPS", 0.0),
+        help="Candidate EMOS CRPS may not be worse than legacy by more than this.",
+    )
+    parser.add_argument(
+        "--max-delta-mae",
+        type=float,
+        default=_env_float("POLYWEATHER_EMOS_AUTO_MAX_DELTA_MAE", 0.05),
+    )
+    parser.add_argument(
+        "--min-delta-bucket-hit-rate",
+        type=float,
+        default=_env_float("POLYWEATHER_EMOS_AUTO_MIN_DELTA_BUCKET_HIT_RATE", -0.05),
+        help="Soft guard only; bucket hit rate is boundary-sensitive.",
+    )
+    args = parser.parse_args()
+
+    version = "emos-auto-{ts}".format(
+        ts=datetime.now(timezone.utc).strftime("%Y%m%d%H%M%S")
+    )
+    candidate_dir = os.path.join(args.candidate_root, version)
+    os.makedirs(candidate_dir, exist_ok=True)
+    candidate_path = os.path.join(candidate_dir, "default.json")
+    evaluation_path = os.path.join(candidate_dir, "evaluation_report.json")
+    decision_path = os.path.join(candidate_dir, "decision_report.json")
+
+    fit_result = _run_python(
+        [
+            "scripts/fit_probability_calibration.py",
+            "--output",
+            candidate_path,
+            "--version",
+            version,
+        ]
+    )
+    if fit_result["returncode"] != 0:
+        payload = {
+            "ok": False,
+            "version": version,
+            "stage": "fit",
+            "fit": fit_result,
+        }
+        _write_json(decision_path, payload)
+        _write_json(args.decision_output, payload)
+        print(json.dumps(payload, ensure_ascii=False, indent=2))
+        return fit_result["returncode"] or 1
+
+    eval_result = _run_python(
+        [
+            "scripts/evaluate_probability_calibration.py",
+            "--calibration-file",
+            candidate_path,
+            "--output",
+            evaluation_path,
+        ]
+    )
+    if eval_result["returncode"] != 0:
+        payload = {
+            "ok": False,
+            "version": version,
+            "stage": "evaluate",
+            "candidate_path": candidate_path,
+            "fit": fit_result,
+            "evaluate": eval_result,
+        }
+        _write_json(decision_path, payload)
+        _write_json(args.decision_output, payload)
+        print(json.dumps(payload, ensure_ascii=False, indent=2))
+        return eval_result["returncode"] or 1
+
+    evaluation_report = _load_json(evaluation_path)
+    decision = judge_candidate(
+        evaluation_report,
+        min_samples=args.min_samples,
+        max_delta_crps=args.max_delta_crps,
+        max_delta_mae=args.max_delta_mae,
+        min_delta_bucket_hit_rate=args.min_delta_bucket_hit_rate,
+    )
+
+    test_result = None
+    if args.run_tests and decision["ready_for_promotion"]:
+        test_result = _run_python(
+            [
+                "-m",
+                "pytest",
+                "tests/test_probability_calibration.py",
+                "tests/test_probability_rollout.py",
+                "tests/test_trend_engine.py",
+            ]
+        )
+        if test_result["returncode"] != 0:
+            decision["decision"] = "hold"
+            decision["ready_for_promotion"] = False
+            decision.setdefault("blocking_reasons", []).append(
+                "focused tests failed"
+            )
+
+    promoted = False
+    backup_path = None
+    if args.promote_if_passed and decision["ready_for_promotion"]:
+        backup_path = _promote(candidate_path, args.target)
+        promoted = True
+
+    payload = {
+        "ok": True,
+        "version": version,
+        "generated_at": datetime.now(timezone.utc).isoformat(),
+        "candidate_dir": candidate_dir,
+        "candidate_path": candidate_path,
+        "evaluation_path": evaluation_path,
+        "target_path": args.target,
+        "promote_requested": bool(args.promote_if_passed),
+        "promoted": promoted,
+        "backup_path": backup_path,
+        "decision": decision,
+        "fit": fit_result,
+        "evaluate": eval_result,
+        "tests": test_result,
+    }
+    _write_json(decision_path, payload)
+    _write_json(args.decision_output, payload)
+    print(json.dumps(payload["decision"], ensure_ascii=False, indent=2))
+    print(f"candidate: {candidate_path}")
+    print(f"evaluation: {evaluation_path}")
+    print(f"decision: {decision_path}")
+    if promoted:
+        print(f"promoted to {args.target}; backup: {backup_path}")
+    elif args.promote_if_passed:
+        print("not promoted; gates did not pass")
+    else:
+        print("not promoted; run with --promote-if-passed to allow gated promotion")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/test_auto_retrain_probability_calibration.py b/tests/test_auto_retrain_probability_calibration.py
new file mode 100644
index 00000000..17e43a38
--- /dev/null
+++ b/tests/test_auto_retrain_probability_calibration.py
@@ -0,0 +1,42 @@
+from scripts.auto_retrain_probability_calibration import judge_candidate
+
+
+def _report(sample_count=80, crps=-0.1, mae=0.0, hit=0.0):
+    return {
+        "summary": {
+            "sample_count": sample_count,
+            "delta": {
+                "crps": crps,
+                "mae": mae,
+                "bucket_hit_rate": hit,
+            },
+        }
+    }
+
+
+def test_candidate_gate_promotes_when_metrics_pass():
+    decision = judge_candidate(
+        _report(),
+        min_samples=50,
+        max_delta_crps=0.0,
+        max_delta_mae=0.05,
+        min_delta_bucket_hit_rate=-0.05,
+    )
+
+    assert decision["decision"] == "promote"
+    assert decision["ready_for_promotion"] is True
+    assert decision["blocking_reasons"] == []
+
+
+def test_candidate_gate_holds_when_metrics_regress():
+    decision = judge_candidate(
+        _report(sample_count=40, crps=0.1, mae=0.2, hit=-0.2),
+        min_samples=50,
+        max_delta_crps=0.0,
+        max_delta_mae=0.05,
+        min_delta_bucket_hit_rate=-0.05,
+    )
+
+    assert decision["decision"] == "hold"
+    assert decision["ready_for_promotion"] is False
+    assert len(decision["blocking_reasons"]) == 4