diff --git a/main/utilities/letter_shell/src/shell.c b/main/utilities/letter_shell/src/shell.c
index cc6ee33..aa60883 100644
--- a/main/utilities/letter_shell/src/shell.c
+++ b/main/utilities/letter_shell/src/shell.c
@@ -1997,11 +1997,25 @@ RETVAL, &shellRetVal, return value of last command);
 
 static void _prompt(int argc, char **argv)
 {
+    char data[64] = {0};
     for (short i = 0; i < SHELL_MAX_NUMBER; i++)
     {
         if (shellList[i] != NULL)
         {
-            shellWriteString(shellList[i], shellText[SHELL_TEXT_INFO]);
+            int idx = 0;
+            int len = strlen(shellText[SHELL_TEXT_INFO]);
+            while (idx < len) {
+                if (len - idx < 64) {
+                    memcpy(data, &shellText[SHELL_TEXT_INFO][idx], len - idx);
+                    data[len - idx + 1] = '\0';
+                    idx += len - idx;
+                    idx++;
+                }else {
+                    memcpy(data, &shellText[SHELL_TEXT_INFO][idx], 64);
+                    idx += 64;
+                }
+                shellWriteString(shellList[i], data);
+            }
             return;
         }
     }