diff --git a/algorithms.py b/algorithms.py
index bf43bed..3e15344 100644
--- a/algorithms.py
+++ b/algorithms.py
@@ -2098,7 +2098,8 @@ class AlgorithmManager:
 
         algo_params = self.default_params.get(algorithm_type, {}).copy()
         # 三级合并：默认参数 → 全局参数 → 绑定级参数
-        global_p = self._global_params.get(algorithm_type, {})
+        with self._update_lock:
+            global_p = self._global_params.get(algorithm_type, {}).copy()
         if global_p:
             algo_params.update(global_p)
         if params:
diff --git a/main.py b/main.py
index b372b97..9b9c656 100644
--- a/main.py
+++ b/main.py
@@ -137,9 +137,12 @@ class EdgeInferenceService:
                     if self._algorithm_manager:
                         global_params = data.get("global_params", {})
                         self._algorithm_manager.update_global_params(global_params)
-                        # 全局参数变更后需要清除注册缓存，使下一帧重新注册算法以应用新参数
-                        self._algorithm_manager._registered_keys.clear()
-                        self._logger.info(f"全局参数回调已触发，已清除算法注册缓存")
+                        # 只清除受影响算法的注册缓存，避免无关算法状态丢失
+                        affected_algos = set(global_params.keys())
+                        keys_to_remove = [k for k in self._algorithm_manager._registered_keys if k[2] in affected_algos]
+                        for key in keys_to_remove:
+                            self._algorithm_manager._registered_keys.discard(key)
+                        self._logger.info(f"全局参数回调已触发，清除 {len(keys_to_remove)} 个受影响算法的注册缓存")
                 self._config_manager.register_callback("global_params_update", _on_global_params_update)
             self._logger.info("配置管理器初始化成功")
         except Exception as e: