diff --git a/ql-application/threadx/interface/custom_app/ws_talkingq.c b/ql-application/threadx/interface/custom_app/ws_talkingq.c
index 47abe9c..d123c37 100644
--- a/ql-application/threadx/interface/custom_app/ws_talkingq.c
+++ b/ql-application/threadx/interface/custom_app/ws_talkingq.c
@@ -187,6 +187,41 @@ static void remove_underscores(char *str) {
     *dst = '\0'; // 添加字符串结束符
 }
 
+/*
+ * 将后台下发的对话超时音频 URL 改为 00~09 中的一条。
+ * 只替换 URL 末尾的文件名，域名和目录保持不变；同时兼容旧文件名 tts_error.mp3。
+ */
+static int randomize_tts_error_url(char *url, size_t url_size)
+{
+    char *file_name;
+    size_t remain_size;
+    unsigned int random_index;
+    int written;
+
+    if(url == NULL || url_size == 0){
+        return 0;
+    }
+
+    file_name = strrchr(url, '/');
+    file_name = (file_name == NULL) ? url : file_name + 1;
+
+    if(strcmp(file_name, "tts_err.mp3") != 0 &&
+       strcmp(file_name, "tts_error.mp3") != 0){
+        return 0;
+    }
+
+    remain_size = url_size - (size_t)(file_name - url);
+    random_index = hal_os_get_rand() % 10;
+    written = snprintf(file_name, remain_size, "tts_err%02u.mp3", random_index);
+    if(written < 0 || (size_t)written >= remain_size){
+        printf("random tts error url buffer too small\n");
+        return -1;
+    }
+
+    printf("random cloud tts error index:%02u, url:%s\n", random_index, url);
+    return 1;
+}
+
 void add_file_to_play_player_queue(char *path, int type)
 {
 	ice_work_item *item = NULL;
@@ -259,12 +294,19 @@ static void onmessage_text(rws_socket socket, const char *text, const unsigned i
 			char *ret_str1= strstr(text, "http:");
 			char *ret_str2= strstr(text, ".mp3");
 			int len = 0;
+			int is_tts_error_url = 0;
 			if(ret_str1!=NULL && ret_str2!=NULL){
 	
 				len = strlen(ret_str1)-strlen(ret_str2);
 				strncpy(url_buff, ret_str1, len);
 				sprintf(url_buff+len, "%s", ".mp3");
 
+				/* 后台 URL 不变，由设备随机选择 tts_err00~tts_err09 */
+				is_tts_error_url = randomize_tts_error_url(url_buff, sizeof(url_buff));
+				if(is_tts_error_url < 0){
+					return;
+				}
+
 				memcpy(url_buff_bak, url_buff, strlen(url_buff)+1);
 				
 				//先把文件下载存入到60k的全局数组里面 然后启动mp3播放
@@ -282,7 +324,7 @@ static void onmessage_text(rws_socket socket, const char *text, const unsigned i
 					tts_play_status = 2;
 				}
 
-				if(strstr(url_buff, "tts_error")!=NULL || strstr(url_buff, "message_ok")!=NULL){
+				if(is_tts_error_url == 1 || strstr(url_buff, "message_ok")!=NULL){
 					printf("tts_error or message_ok\n");
 					vad_set_speech_timeout_flag(1);
 				}