diff --git a/include/uv.h b/include/uv.h
index 0d39684b8e71dca3ea92a16321fa7e480a295c0a..554629840ad01e6a67e58a7b146ba58fcaca80cf 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -1187,7 +1187,8 @@ typedef enum {
   uv_qos_utility = 1,
   uv_qos_default = 2,
   uv_qos_user_initiated = 3,
-  uv_qos_user_interactive = 4,
+  uv_qos_reserved = 4, /* Do not use this qos, reserved for now. */
+  uv_qos_user_interactive = 5,
 } uv_qos_t;
 
 UV_EXTERN int uv_queue_work_with_qos(uv_loop_t* loop,
diff --git a/src/threadpool.c b/src/threadpool.c
index ee86f7b1340f8bf93ff472f74b92dc445bab9f82..4d1675edc5631d5c66a7356c94a69e52e1ac4f96 100644
--- a/src/threadpool.c
+++ b/src/threadpool.c
@@ -693,7 +693,11 @@ void uv__work_done(uv_async_t* handle) {
   uv__loop_internal_fields_t* lfields = uv__get_internal_fields(loop);
   int i;
   uv__queue_init(&wq);
-  for (i = 4; i >= 0; i--) {
+  for (i = uv_qos_user_interactive; i >= 0; i--) {
+    // No task in 4-th lfields->wq_sub queue.
+    if (i == uv_qos_reserved) {
+      continue;
+    }
     if (!uv__queue_empty(&lfields->wq_sub[i])) {
       uv__queue_append(&lfields->wq_sub[i], &wq);
     }
@@ -940,8 +944,12 @@ int uv_queue_work_with_qos(uv_loop_t* loop,
   STATIC_ASSERT(uv_qos_utility == ffrt_qos_utility);
   STATIC_ASSERT(uv_qos_default == ffrt_qos_default);
   STATIC_ASSERT(uv_qos_user_initiated == ffrt_qos_user_initiated);
-  STATIC_ASSERT(uv_qos_user_interactive == ffrt_qos_deadline_request);
-  if (qos < ffrt_qos_background || qos > ffrt_qos_deadline_request) {
+  STATIC_ASSERT(uv_qos_user_interactive == ffrt_qos_user_interactive);
+  if (qos == uv_qos_reserved) {
+    UV_LOGW("Invaild qos %{public}d", (int)qos);
+    return UV_EINVAL;
+  }
+  if (qos < ffrt_qos_background || qos > ffrt_qos_user_interactive) {
     return UV_EINVAL;
   }
 
diff --git a/src/unix/loop.c b/src/unix/loop.c
index 2a304081e7a78092f688f00cb6f947ebfe05920a..32206a2c944c6a7b3e9ba2b28b24ebe8c4485b0f 100644
--- a/src/unix/loop.c
+++ b/src/unix/loop.c
@@ -57,6 +57,7 @@ int uv_loop_init(uv_loop_t* loop) {
   uv__queue_init(&(lfields_qos->wq_sub[uv_qos_utility]));
   uv__queue_init(&(lfields_qos->wq_sub[uv_qos_default]));
   uv__queue_init(&(lfields_qos->wq_sub[uv_qos_user_initiated]));
+  uv__queue_init(&(lfields_qos->wq_sub[uv_qos_reserved]));
   uv__queue_init(&(lfields_qos->wq_sub[uv_qos_user_interactive]));
 #endif
 
diff --git a/src/uv-common.h b/src/uv-common.h
index ac0bbb9ad1729493589479cf0cb0a1645193808c..25b90119b8f2c781a9194c32c192621f4eef50f5 100644
--- a/src/uv-common.h
+++ b/src/uv-common.h
@@ -41,6 +41,10 @@
 # include <stdatomic.h>
 #endif
 
+#ifdef USE_FFRT
+#define WQ_SUB_QUEUE_LEN 6
+#endif
+
 #if defined(USE_OHOS_DFX) && defined(__aarch64__)
 #define MULTI_THREAD_CHECK_LOOP_INIT 0x80000000
 #endif
@@ -451,7 +455,7 @@ struct uv__loop_internal_fields_s {
   void* inv;  /* used by uv__platform_invalidate_fd() */
 #endif  /* __linux__ */
 #ifdef USE_FFRT
-  struct uv__queue wq_sub[5];
+  struct uv__queue wq_sub[WQ_SUB_QUEUE_LEN];
 #endif
 #if defined(USE_OHOS_DFX) && defined(__aarch64__)
   unsigned int thread_id;