diff --git a/ylong_runtime/src/executor/async_pool.rs b/ylong_runtime/src/executor/async_pool.rs
index a3f42d966719e62d8fcede629fc14ef1ff43b9e5..5bf03f3a54aeeab5c084e7cfc2687a9ba4a563d9 100644
--- a/ylong_runtime/src/executor/async_pool.rs
+++ b/ylong_runtime/src/executor/async_pool.rs
@@ -317,7 +317,7 @@ impl MultiThreadScheduler {
         }
 
         let num = self.locals.len();
-        let start = fast_random() >> 56;
+        let start = (fast_random() >> 56) as usize;
 
         for i in 0..num {
             let i = (start + i) % num;
diff --git a/ylong_runtime/src/net/async_source.rs b/ylong_runtime/src/net/async_source.rs
index 910ad187c9daee77026bf677853d65333cb32b3e..831b33a573643caa9e179e89fd7cda5a49e74133 100644
--- a/ylong_runtime/src/net/async_source.rs
+++ b/ylong_runtime/src/net/async_source.rs
@@ -53,7 +53,7 @@ impl<E: Source> AsyncSource<E> {
     pub fn new(mut io: E, interest: Option<Interest>) -> io::Result<AsyncSource<E>> {
         #[cfg(not(feature = "ffrt"))]
         let inner = {
-            let context = get_current_ctx().ok_or(io::Error::new(io::ErrorKind::Other, "get_current_ctx() fail"))?;
+            let context = get_current_ctx().ok_or_else(|| io::Error::new(io::ErrorKind::Other, "get_current_ctx() fail"))?;
             match context {
                 WorkerContext::Multi(ctx) => &ctx.handle,
                 WorkerContext::Curr(ctx) => &ctx.handle,
diff --git a/ylong_runtime/src/select.rs b/ylong_runtime/src/select.rs
index c14c9846fc9ddafdaff2b9561f51458deaa46922..3b1c45548b57964129eca58a7d96e610ffb74b6e 100644
--- a/ylong_runtime/src/select.rs
+++ b/ylong_runtime/src/select.rs
@@ -200,7 +200,7 @@ macro_rules! select {
         // When a branch ready first, modify this variable to
         // branch's index to ensure that the branch is executed first.
         use $crate::util::fastrand::fast_random;
-        let mut random_number = fast_random();
+        let mut random_number = fast_random() as usize;
 
         let output = {
             let mut futures = ( $( $fut , )+ );
diff --git a/ylong_runtime/src/util/fastrand.rs b/ylong_runtime/src/util/fastrand.rs
index d66aff9c5b89acd7aa636cbfaf4b2f1dd0ebd898..8013c0398298cab8c48f02028484e75310360804 100644
--- a/ylong_runtime/src/util/fastrand.rs
+++ b/ylong_runtime/src/util/fastrand.rs
@@ -25,9 +25,9 @@ use std::num::Wrapping;
 /// ```rust
 /// use ylong_runtime::util::fastrand::fast_random;
 /// let rand = fast_random();
-/// assert!(rand <= usize::MAX);
+/// assert!(rand <= u64::MAX);
 /// ```
-pub fn fast_random() -> usize {
+pub fn fast_random() -> u64 {
     thread_local! {
         static RNG: Cell<Wrapping<u64>> = Cell::new(Wrapping(seed()));
     }
@@ -39,7 +39,7 @@ pub fn fast_random() -> usize {
         s ^= s >> 27;
         rng.set(s);
         s.0.wrapping_mul(0x2545_f491_4f6c_dd1d)
-    }) as usize
+    })
 }
 
 fn seed() -> u64 {