diff --git a/components/net/at/src/at_cli.c b/components/net/at/src/at_cli.c
index c589bb68a0..d51358d863 100644
--- a/components/net/at/src/at_cli.c
+++ b/components/net/at/src/at_cli.c
@@ -264,6 +264,10 @@ static void client_cli_parser(at_client_t  client)
                 }
                 else
                 {
+                    if(cur_line_len >= FINSH_CMD_SIZE)
+                    {
+                        continue;
+                    }
                     rt_kprintf("%c", ch);
                     cur_line[cur_line_len++] = ch;
                 }