diff --git a/backend/signal_engine.py b/backend/signal_engine.py
index 76bff1c..6ea5c20 100644
--- a/backend/signal_engine.py
+++ b/backend/signal_engine.py
@@ -42,7 +42,7 @@ logger = logging.getLogger("signal-engine")
 SYMBOLS = ["BTCUSDT", "ETHUSDT", "XRPUSDT", "SOLUSDT"]
 LOOP_INTERVAL = 15  # 秒（从5改15，CPU降60%，信号质量无影响）
 STRATEGY_DIR = os.path.join(os.path.dirname(__file__), "strategies")
-DEFAULT_STRATEGY_FILES = ["v51_baseline.json", "v52_8signals.json", "v53.json", "v53_fast.json"]
+DEFAULT_STRATEGY_FILES = ["v51_baseline.json", "v52_8signals.json", "v53.json", "v53_fast.json", "v53_middle.json"]
 
 
 def load_strategy_configs() -> list[dict]: