diff --git a/backend/signal_engine.py b/backend/signal_engine.py
index bab8d82..0537c1a 100644
--- a/backend/signal_engine.py
+++ b/backend/signal_engine.py
@@ -1580,6 +1580,10 @@ def main():
                         strategy_name = strategy_cfg.get("name", "v51_baseline")
                         if not is_strategy_enabled(strategy_name):
                             continue
+                        # V5.4: custom策略只处理自己配置的symbol
+                        strategy_symbol = strategy_cfg.get("symbol", "")
+                        if strategy_symbol and strategy_symbol != sym:
+                            continue
                         eval_dir = result.get("direction")
                         existing_dir = paper_get_active_direction(sym, strategy_name)
                         if existing_dir and eval_dir and existing_dir != eval_dir and result["score"] >= 75:
@@ -1598,6 +1602,10 @@ def main():
                         )
                         # 模拟盘开仓（需该策略启用 + 跳过冷启动）
                         if is_strategy_enabled(strategy_name) and warmup_cycles <= 0:
+                            # V5.4: custom策略只在自己配置的symbol上开仓
+                            strategy_symbol = strategy_cfg.get("symbol", "")
+                            if strategy_symbol and strategy_symbol != sym:
+                                continue  # 跳过不属于该策略的币种
                             if not paper_has_active_position(sym, strategy_name):
                                 active_count = paper_active_count(strategy_name)
                                 if active_count < PAPER_MAX_POSITIONS: