diff --git a/category/get_net_info.py b/category/get_net_info.py
index 0efed29e67baa81baff413d8b5728e1effe647a6..73aef54ef36e347a27ba4d9d5ae7f63ea64a30cf 100644
--- a/category/get_net_info.py
+++ b/category/get_net_info.py
@@ -149,6 +149,15 @@ class NetInfo:
         res_e = FileOperation.wrap_output_format(cmd_name, sar_result_e, '=')
         # print("Sar_dev task 2 completed")
         return res_e
+    
+    def __get_sar_DEV_info(self, interval, times):
+        '''
+            sar -n DEV
+        '''
+        # Multithreading obtains "sar -n DEV" command information
+        tasks = [self.__get_sar_DEV_task1, self.__get_sar_DEV_task2]
+        res = self.__multi_threads_get_info(tasks, interval, times)
+        return Command.cmd_write_file(res, self.__default_file_name)
 
     def get_info(self):
         '''
@@ -158,4 +167,4 @@ class NetInfo:
             return False
         self.__get_devices_info()
         self.__get_eth_off_info()
-        
\ No newline at end of file
+        self.__get_sar_DEV_info(self.__interval, self.__times)
\ No newline at end of file