diff --git a/tests/api/test_routes.py b/tests/api/test_routes.py
index 7a5a9ed..02c00c1 100644
--- a/tests/api/test_routes.py
+++ b/tests/api/test_routes.py
@@ -509,8 +509,11 @@ def test_benchmark_curve_endpoint():
         assert len(data["benchmark"]) == 2
 
 
-def test_benchmark_curve_endpoint_not_found():
-    """Test GET /api/v1/task/:id/benchmark-curve returns 404 when file not found"""
+def test_benchmark_curve_endpoint_degrades_gracefully():
+    """Test GET /api/v1/task/:id/benchmark-curve returns 200 + empty series when file not found
+
+    基准缺失走降级(前端画单序列),不再 404 —— 与 cta_engine 降级行为对齐。
+    """
     from sanguo_api.app import create_app
     from sanguo_api.auth import set_jwt_config, create_token
     import tempfile
@@ -526,7 +529,9 @@ def test_benchmark_curve_endpoint_not_found():
         client = TestClient(app)
         response = client.get("/api/v1/task/unknown_task/benchmark-curve", headers={"Authorization": f"Bearer {token}"})
 
-        assert response.status_code == 404
+        assert response.status_code == 200
+        data = response.json()
+        assert data == {"dates": [], "strategy": [], "benchmark": []}
 
 
 def test_risk_series_endpoint():
@@ -578,8 +583,11 @@ def test_risk_series_endpoint():
         assert len(data["dates"]) == 2
 
 
-def test_risk_series_endpoint_not_found():
-    """Test GET /api/v1/task/:id/risk-series returns 404 when file not found"""
+def test_risk_series_endpoint_degrades_gracefully():
+    """Test GET /api/v1/task/:id/risk-series returns 200 + empty series when file not found
+
+    数据缺失走降级空序列,不再 404 —— 前端据此隐藏图而非报错。
+    """
     from sanguo_api.app import create_app
     from sanguo_api.auth import set_jwt_config, create_token
     import tempfile
@@ -595,7 +603,9 @@ def test_risk_series_endpoint_not_found():
         client = TestClient(app)
         response = client.get("/api/v1/task/unknown_task/risk-series", headers={"Authorization": f"Bearer {token}"})
 
-        assert response.status_code == 404
+        assert response.status_code == 200
+        data = response.json()
+        assert data == {"dates": [], "alpha": [], "beta": [], "drawdown": [], "strategy_vol": [], "benchmark_vol": []}
 
 
 def test_daily_holdings_endpoint():