diff --git a/Ubiquitous/XiZi/tool/shell/letter-shell/shell.c b/Ubiquitous/XiZi/tool/shell/letter-shell/shell.c
index 201178a12..b438110d1 100644
--- a/Ubiquitous/XiZi/tool/shell/letter-shell/shell.c
+++ b/Ubiquitous/XiZi/tool/shell/letter-shell/shell.c
@@ -1649,15 +1649,12 @@ void shellTask(void *param)
         if (shell->read) {
             memset(data, 0, KEY_LENGTH);
             data_len = 0;
-            x_base lock;
 
             data_len = shell->read(data);
             if(data_len > 0) {
-                int lock = CriticalAreaLock();
                 for (i = 0; i < data_len; i++) {
                     shellHandler(shell, data[i]);
                 }
-                CriticalAreaUnLock(lock);
             }
         }
     }