diff --git a/venus/db/sqlalchemy/migrate_repo/versions/001_venus_init.py b/venus/db/sqlalchemy/migrate_repo/versions/001_venus_init.py
index b05b982..0dc860d 100644
--- a/venus/db/sqlalchemy/migrate_repo/versions/001_venus_init.py
+++ b/venus/db/sqlalchemy/migrate_repo/versions/001_venus_init.py
@@ -71,7 +71,7 @@ def upgrade(migrate_engine):
 
     t_mo_custom_config.create(migrate_engine, checkfirst=True)
     new_data = {
-        'id': 'es_index_length',
+        'id': 'log_save_days',
         'value': '30',
         'update_time': '1900-01-01 00:00:00'
     }
diff --git a/venus/modules/custom_config/controller.py b/venus/modules/custom_config/controller.py
index c2751d1..29d7694 100644
--- a/venus/modules/custom_config/controller.py
+++ b/venus/modules/custom_config/controller.py
@@ -27,7 +27,7 @@ class CustomConfigController(wsgi.Controller):
     @wsgi.wrap_check_policy
     def get_config(self, req):
         result = dict()
-        result["log_save_days"] = self.config_api.get_config("es_index_length")
+        result["log_save_days"] = self.config_api.get_config("log_save_days")
         return result
 
     @wsgi.wrap_check_policy
diff --git a/venus/task/core/delete_es_index_task.py b/venus/task/core/delete_es_index_task.py
index 1f50b7c..db99352 100644
--- a/venus/task/core/delete_es_index_task.py
+++ b/venus/task/core/delete_es_index_task.py
@@ -42,11 +42,11 @@ class DeleteESIndexTask(object):
             return
 
     def delete_es_history_index(self):
-        len_d = self.config_api.get_config("es_index_length")
+        len_d = self.config_api.get_config("log_save_days")
         if len_d is None:
-            LOG.error(_LE("es_index_length no exist"))
+            LOG.error(_LE("the config of log_save_days do not exist"))
             return
-        LOG.info("the elasticsearch indexes keep days {}".format(len_d))
+        LOG.info("the elasticsearch indexes(log) save days {}".format(len_d))
         today = time.strftime('%Y-%m-%d')
         try:
             indexes_array = self.search_lib.get_all_index()
@@ -73,5 +73,4 @@ class DeleteESIndexTask(object):
             self.delete_es_history_index()
             LOG.info(_LI("delete es index task done"))
         except Exception as e:
-            LOG.error(_LE("delete es index task, catch exception:%s"),
-                      str(e))
+            LOG.error(_LE("delete es index task, catch exception:%s"), str(e))