diff --git a/data_downloader.py b/data_downloader.py
index aa57fbc..1370e34 100644
--- a/data_downloader.py
+++ b/data_downloader.py
@@ -10,7 +10,7 @@ from functools import partial
 from sqlalchemy import create_engine, text
 from datetime import datetime, timedelta
 
-from utils import load_config, create_engine_from_config
+from utils import load_config, get_engine
 
 
 def create_metadata_table(engine):
@@ -351,7 +351,7 @@ def process_stock_batch(batch, config, update_mode, start_date, end_date):
         dict: 包含处理结果统计信息的字典
     """
     # 为当前进程创建新的数据库连接和API连接
-    engine = create_engine_from_config(config)
+    engine = get_engine()
     ts.set_token(config['tushare_token'])
     pro = ts.pro_api()
 
@@ -567,7 +567,7 @@ def perform_full_update(start_year=2020, processes=4, resume=False):
     config = load_config()
 
     # 创建数据库引擎
-    engine = create_engine_from_config(config)
+    engine = get_engine()
 
     # 设置Tushare API
     ts.set_token(config['tushare_token'])
@@ -767,7 +767,7 @@ def perform_incremental_update(processes=4):
     config = load_config()
 
     # 创建数据库引擎
-    engine = create_engine_from_config(config)
+    engine = get_engine()
 
     # 设置Tushare API
     ts.set_token(config['tushare_token'])
@@ -787,7 +787,7 @@ def perform_incremental_update(processes=4):
         FROM
             stock_metadata
         WHERE
-            list_status = 'L'
+            list_status = 'L' AND status = 1 
         """
         result = conn.execute(text(query))
         for row in result:
@@ -807,12 +807,8 @@ def perform_incremental_update(processes=4):
                 if not latest_update or last_full_update > latest_update:
                     latest_update = last_full_update
 
-            # 如果有更新日期，使用其后一天作为起始日期
-            if latest_update:
-                start_date = (latest_update + timedelta(days=1)).strftime('%Y%m%d')
-            else:
-                # 如果没有任何更新记录，默认从30天前开始
-                start_date = (datetime.now() - timedelta(days=30)).strftime('%Y%m%d')
+            # 使用全量/增量最晚的一个时间
+            start_date = latest_update.strftime('%Y%m%d')
 
             # 如果起始日期大于等于结束日期，则跳过此股票
             if start_date >= end_date:
@@ -829,9 +825,6 @@ def perform_incremental_update(processes=4):
 
     print(f"共找到 {len(stocks_to_update)} 只股票需要增量更新")
 
-    # 当前更新时间
-    update_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
-
     # 将股票列表分成多个批次
     batches = split_list_into_chunks(stocks_to_update, processes)
 
@@ -843,8 +836,7 @@ def perform_incremental_update(processes=4):
             config=config,
             update_mode='incremental',
             start_date=None,  # 增量模式下使用每个股票自己的起始日期
-            end_date=end_date,
-            update_time=update_time
+            end_date=end_date
         )
 
         # 启动多进程处理并收集结果
@@ -1019,7 +1011,7 @@ def main():
     # 加载配置
     config = load_config()
     # 创建数据库引擎
-    engine = create_engine_from_config(config)
+    engine = get_engine()
     # 设置Tushare API
     ts.set_token(config['tushare_token'])
     pro = ts.pro_api()
diff --git a/utils.py b/utils.py
index 0c33b9d..2d466ed 100644
--- a/utils.py
+++ b/utils.py
@@ -6,8 +6,16 @@ from datetime import datetime, timedelta
 
 from sqlalchemy import create_engine
 
+# 模块级单例
+_config = None
+_engine = None
+
 
 def load_config():
+    global _config
+    if _config is not None:
+        return _config
+
     config_path = 'config.yaml'
     if not os.path.exists(config_path):
         config = {
@@ -27,11 +35,16 @@ def load_config():
         exit(1)
 
     with open(config_path, 'r') as f:
-        config = yaml.safe_load(f)
-    return config
+        _config = yaml.safe_load(f)
+    return _config
 
 
-def create_engine_from_config(config):
-    mysql = config['mysql']
-    connection_string = f"mysql+pymysql://{mysql['user']}:{mysql['password']}@{mysql['host']}:{mysql['port']}/{mysql['database']}?charset={mysql['charset']}&use_unicode=1"
-    return create_engine(connection_string)
+def get_engine():
+    """获取单例数据库引擎"""
+    global _engine
+    if _engine is None:
+        config = load_config()
+        mysql = config['mysql']
+        connection_string = f"mysql+pymysql://{mysql['user']}:{mysql['password']}@{mysql['host']}:{mysql['port']}/{mysql['database']}?charset={mysql['charset']}&use_unicode=1"
+        _engine = create_engine(connection_string)
+    return _engine
\ No newline at end of file