diff --git a/sanguo_api/routes.py b/sanguo_api/routes.py
index 29c4c8a..0da44c9 100644
--- a/sanguo_api/routes.py
+++ b/sanguo_api/routes.py
@@ -329,11 +329,16 @@ def optimization_results(task_id: str):
 # ===== Task 4: Backtest result API extensions =====
 
 def _get_metrics_file_path(task_id: str) -> str | None:
-    """Get the metrics file path for a task_id from orchestrator config."""
+    """Get the metrics file path. Resolves the request task_id to the result's
+    internal task_id first — run_cta_backtest writes {task_id}_metrics.json under
+    ITS OWN uuid task_id (result.task_id), which differs from the runner's task_id."""
     orch = get_orchestrator()
+    r = orch.get_result(task_id)
+    if r is None or not getattr(r, "task_id", None):
+        return None
     if hasattr(orch, 'db_path') and orch.db_path:
         file_dir = os.path.dirname(os.path.abspath(orch.db_path))
-        metrics_file = os.path.join(file_dir, f"{task_id}_metrics.json")
+        metrics_file = os.path.join(file_dir, f"{r.task_id}_metrics.json")
         if os.path.exists(metrics_file):
             return metrics_file
     return None