diff --git a/src/model_trainer.py b/src/model_trainer.py
index bc0b833..a38a54c 100644
--- a/src/model_trainer.py
+++ b/src/model_trainer.py
@@ -279,14 +279,7 @@ class ModelTrainer:
             with get_db_connection() as conn:
                 cursor = conn.cursor()
                 
-                # 将所有同类型模型设置为非激活, 除了 PLS 模型
-                cursor.execute("""
-                    UPDATE trained_models 
-                    SET is_active = FALSE 
-                    WHERE equipment_type = ? AND model_type != ?
-                """, (equipment_type, 'pls'))
-                
-                # 保存新模型记录
+                # 保存新模型记录（设置为激活）
                 cursor.execute("""
                     INSERT INTO trained_models (
                         model_name, model_type, equipment_type, model_path, 
@@ -679,19 +672,13 @@ class ModelTrainer:
             with get_db_connection() as conn:
                 cursor = conn.cursor()
                 
-                # 将同类型的其他模型设置为非激活
-                if model_type != 'pls':
+                # PLS：每个装备类型只保留最新一个
+                if model_type == 'pls':
                     cursor.execute("""
                         UPDATE trained_models 
                         SET is_active = FALSE 
-                        WHERE equipment_type = ? AND model_type != ?
-                    """, (equipment_type, 'pls'))
-                else:
-                    cursor.execute("""
-                        UPDATE trained_models 
-                        SET is_active = FALSE 
-                        WHERE equipment_type = ? AND model_type = ?
-                    """, (equipment_type, 'pls'))
+                        WHERE equipment_type = ? AND model_type = 'pls'
+                    """, (equipment_type,))
                 
                 # 保存新模型记录
                 cursor.execute("""