diff --git a/download_speed/config.py b/download_speed/config.py
index 0c235d7..1dd1e1f 100644
--- a/download_speed/config.py
+++ b/download_speed/config.py
@@ -1,14 +1,14 @@
 import argparse
 import json
 import sys
-
-g_args = None
-json_obj = None
+print('Config is loaded.')
+_g_args = None
+_json_obj = None
 
 
 def get_servers():
-    global json_obj
-    js = json_obj
+    global _json_obj
+    js = _json_obj
     _servers = js["servers"]
     servers_dic = {}
     for s in _servers:
@@ -19,8 +19,8 @@ def get_servers():
 
 
 def read_json():
-    global g_args
-    json_path = g_args.config
+    global _g_args
+    json_path = _g_args.config
     if json_path is None:
         print("specify json path")
         sys.exit()
@@ -30,23 +30,32 @@ def read_json():
 
 
 def get_config():
-    global json_obj
-    return json_obj
+    global _json_obj
+    return _json_obj
 
 
 def init_config():
-    global g_args
-    if g_args is not None:
-        return g_args
+    global _g_args
+    if _g_args is not None:
+        return _g_args
     parser = argparse.ArgumentParser(description="Help")
     parser.add_argument("-config", type=str)
     _args = parser.parse_args()
-    g_args = _args
-    global json_obj
-    json_obj = read_json()
+    _g_args = _args
+    global _json_obj
+    _json_obj = read_json()
     return _args
 
 
+def get(_setting):
+    if _setting in setting:
+        return setting[_setting]
+    else:
+        return None
+
+
+init_config()
+setting = _json_obj
+
 if __name__ == "__main__":
-    args = init_config()
-    print(args.config)
+    pass
diff --git a/download_speed/downloader.py b/download_speed/downloader.py
index c0cce84..70d2a9f 100644
--- a/download_speed/downloader.py
+++ b/download_speed/downloader.py
@@ -6,6 +6,9 @@ from download_speed import config, model
 # file_size if byte
 # longest_time seconds
 def download_file(chunk_size=4 * 1024, file_size=100 * 1024 * 1024, longest_time=60):
+    config_file_size = config.get("download_file_size")
+    if config_file_size is not None:
+        file_size = config_file_size
     execution_datetime = datetime.datetime.now()
     print("Download at {time}".format(time=execution_datetime))
     print(
diff --git a/download_speed/model.py b/download_speed/model.py
index 4357d0b..8160886 100644
--- a/download_speed/model.py
+++ b/download_speed/model.py
@@ -3,13 +3,15 @@ import datetime
 from download_speed import config
 
 config.init_config()
-mysql_addr = config.read_json()
+mysql_addr = config.get('mysql_addr')
 mysql_db = MySQLDatabase(
     "vps", user="dmy", password="abc123+_", host=mysql_addr, port=3306
 )
 
 
 def add_record(execution_datetime, server, speed):
+    if not config.get('mysql_enable'):
+        return
     execution_datetime_utc = execution_datetime - datetime.timedelta(
         hours=8
     )  # 转换为UTC时间。
@@ -22,6 +24,8 @@ def add_record(execution_datetime, server, speed):
 
 
 def add_ping_record(execution_datetime, server, ping):
+    if not config.get('mysql_enable'):
+        return
     execution_datetime_utc = execution_datetime - datetime.timedelta(
         hours=8
     )  # 转换为UTC时间。
diff --git a/main.py b/main.py
index 147e922..324303f 100644
--- a/main.py
+++ b/main.py
@@ -3,11 +3,5 @@
 from download_speed import downloader, config
 
 if __name__ == "__main__":
-    config.init_config()
-    setting = config.get_config()
-    if "download_file_size" in setting:
-        download_file_size = setting["download_file_size"]
-        downloader.download_file(file_size=download_file_size)
-    else:
-        downloader.download_file()
+    downloader.download_file()
     print("Finished.")