diff --git a/images_build/client/dign_client/bin/client.py b/images_build/client/dign_client/bin/client.py
index b302fc5..01e1651 100644
--- a/images_build/client/dign_client/bin/client.py
+++ b/images_build/client/dign_client/bin/client.py
@@ -244,10 +244,10 @@ class CommandParser:
                             help='The time interval in seconds between consecutive TSG diagnose operations. Default: 30.')
         parser.add_argument('-c','--count',  type = int, default = 1, 
                             help='Specifies the number of TSG diagnoses. Default: 1. Range: [1,65535].')
-        parser.add_argument('-l','--loop',  action='store_true', default = False, 
-                            help='Enable TSG diagnose loop, exit when recv a signal.')
+        parser.add_argument('--periodical',  action='store_true', default = False, 
+                            help='Enable TSG diagnose periodical, exit when recv a signal.')
         parser.add_argument('--service_function_names_regexp', type = str, default = '.+',
-                            help = "Regexp of the case names to run. Example: .+")
+                            help = "Regexp of the service function names to run. Example: .+")
         parser.add_argument('--service_function_config_path',  type = str, default = '/opt/dign_client/share/service_function_maps.yaml',
                             help = "Specifies the service function config file, default /opt/dign_client/share/service_function_maps.yaml")
         parser.add_argument('--config_path', type = str, default = '/opt/dign_client/etc/client.conf',
@@ -270,7 +270,7 @@ class CommandParser:
 
         self.__interval_s = args.interval
         self.__count = args.count
-        self.__loop = args.loop
+        self.__loop = args.periodical
         self.__config_path = args.config_path
         self.__case_names_regexp = args.case_names_regexp
         self.__service_function_names_regexp = args.service_function_names_regexp