diff --git a/components/net/at/Kconfig b/components/net/at/Kconfig
index a1f1b8199d..b1909f86bf 100644
--- a/components/net/at/Kconfig
+++ b/components/net/at/Kconfig
@@ -74,6 +74,10 @@ if RT_USING_AT
        config AT_PRINT_RAW_CMD
             bool "Enable print RAW format AT command communication data"
             default n
+
+        config AT_CMD_MAX_LEN
+            int "The maximum lenght of AT Commonds buffer"
+            default 128
          
     endif