diff --git a/src/others/ime/lv_ime_pinyin.c b/src/others/ime/lv_ime_pinyin.c
index b763be443..8382269b7 100644
--- a/src/others/ime/lv_ime_pinyin.c
+++ b/src/others/ime/lv_ime_pinyin.c
@@ -707,7 +707,8 @@ static void lv_ime_pinyin_kb_event(lv_event_t * e)
         }
         else if((pinyin_ime->mode == LV_IME_PINYIN_MODE_K26) && ((txt[0] >= 'a' && txt[0] <= 'z') || (txt[0] >= 'A' &&
                                                                                                       txt[0] <= 'Z'))) {
-            lv_strcat(pinyin_ime->input_char, txt);
+            uint16_t len = lv_strlen(pinyin_ime->input_char);
+            lv_snprintf(pinyin_ime->input_char + len, sizeof(pinyin_ime->input_char) - len, "%s", txt);
             pinyin_input_proc(obj);
             pinyin_ime->ta_count++;
         }