diff --git a/sanguo_api/routes.py b/sanguo_api/routes.py
index abd49ac..29c4c8a 100644
--- a/sanguo_api/routes.py
+++ b/sanguo_api/routes.py
@@ -75,7 +75,8 @@ async def submit_cta(req: CtaBacktestRequest):
         params=req.params,
         start=req.start,
         end=req.end,
-        cfg=None
+        cfg=None,
+        benchmark=req.benchmark
     )
     return {"task_id": tid}
 
diff --git a/sanguo_backtest/cta_engine.py b/sanguo_backtest/cta_engine.py
index 910ddc7..54384eb 100644
--- a/sanguo_backtest/cta_engine.py
+++ b/sanguo_backtest/cta_engine.py
@@ -47,7 +47,7 @@ def guess_exchange(symbol: str) -> Exchange:
     return Exchange("SSE")
 
 
-def run_cta_backtest(strategy_class, symbol: str, params: dict, start: str, end: str, cfg, db_path: str) -> BacktestResult:
+def run_cta_backtest(strategy_class, symbol: str, params: dict, start: str, end: str, cfg, db_path: str, benchmark: str = "hs300") -> BacktestResult:
     """
     Run CTA strategy backtest using vnpy_ctastrategy BacktestingEngine.
 
@@ -98,6 +98,9 @@ def run_cta_backtest(strategy_class, symbol: str, params: dict, start: str, end:
 
         # Configure vnpy DB → A-share quant_trading.db. Worker process (spawn)
         # doesn't inherit main-process SETTINGS, so set before engine.load_data.
+        # _dcfg is also reused by the metrics branch (benchmark data_paths) since the
+        # cfg param can be None when called via the API.
+        _dcfg = None
         try:
             from vnpy.trader.setting import SETTINGS
             from sanguo_data.config import load_config, find_config_path
@@ -129,16 +132,17 @@ def run_cta_backtest(strategy_class, symbol: str, params: dict, start: str, end:
             if not isinstance(daily_df.index, pd.DatetimeIndex):
                 daily_df.index = pd.to_datetime(daily_df.index)
 
-            # Get benchmark config (default hs300)
-            benchmark_key = getattr(cfg, "benchmark", "hs300") if hasattr(cfg, "benchmark") else "hs300"
-            benchmark_code = BENCHMARK_SYMBOL.get(benchmark_key, "sh000300")
+            # Get benchmark code (default hs300) + a cfg that has data_paths.
+            # _dcfg is the loaded config; fall back to the passed cfg if loading failed.
+            benchmark_code = BENCHMARK_SYMBOL.get(benchmark, "sh000300")
+            bench_cfg = _dcfg if (_dcfg is not None and hasattr(_dcfg, "data_paths")) else cfg
 
             # Load benchmark data
             start_date = start_dt if isinstance(start_dt, datetime) else datetime.strptime(start, "%Y-%m-%d")
             end_date = end_dt if isinstance(end_dt, datetime) else datetime.strptime(end, "%Y-%m-%d")
 
             try:
-                bench_df = read_index_daily(benchmark_code, start_date, end_date, cfg)
+                bench_df = read_index_daily(benchmark_code, start_date, end_date, bench_cfg)
                 if bench_df is not None and not bench_df.empty and "close" in bench_df.columns:
                     # Calculate benchmark daily returns
                     bench_df["date"] = pd.to_datetime(bench_df["date"])
diff --git a/sanguo_orchestrator/runner.py b/sanguo_orchestrator/runner.py
index aa9c0e8..5148490 100644
--- a/sanguo_orchestrator/runner.py
+++ b/sanguo_orchestrator/runner.py
@@ -30,7 +30,7 @@ class Orchestrator:
             await self._on_stage(task_id, stage)
 
     async def submit_cta(self, strategy_class, symbol: str, params: dict,
-                       start: str, end: str, cfg) -> str:
+                       start: str, end: str, cfg, benchmark: str = "hs300") -> str:
         """Submit a CTA backtesting task asynchronously"""
         task_id = f"cta_{symbol}_{id(params)}"
         self.pool.submit(task_id, "cta")
@@ -40,14 +40,15 @@ class Orchestrator:
             params=params,
             start=start,
             end=end,
-            cfg=cfg
+            cfg=cfg,
+            benchmark=benchmark
         )
         await self._notify_stage(task_id, "排队中")
 
         spec = self._pending[task_id]
         fut: Future = self.pool.submit_work(
             task_id, _cta_worker, spec["strategy_class"], spec["symbol"],
-            spec["params"], spec["start"], spec["end"], spec["cfg"], self.db_path
+            spec["params"], spec["start"], spec["end"], spec["cfg"], spec["benchmark"], self.db_path
         )
 
         task = self.pool.get_task(task_id)
@@ -164,10 +165,10 @@ class Orchestrator:
 
 
 # Module-level worker functions (must be top-level for ProcessPoolExecutor pickle)
-def _cta_worker(strategy_class, symbol: str, params: dict, start: str, end: str, cfg, db_path: str) -> any:
+def _cta_worker(strategy_class, symbol: str, params: dict, start: str, end: str, cfg, benchmark: str, db_path: str) -> any:
     """Worker for CTA backtest (lazy import, spawn-friendly)"""
     from sanguo_backtest.cta_engine import run_cta_backtest
-    return run_cta_backtest(strategy_class, symbol, params, start, end, cfg, db_path)
+    return run_cta_backtest(strategy_class, symbol, params, start, end, cfg, db_path, benchmark=benchmark)
 
 
 def _opt_worker(strategy_class, symbol: str, grid: dict, start: str, end: str, cfg, db_path: str) -> any: