diff --git a/ylong_http/src/body/text.rs b/ylong_http/src/body/text.rs
index dc2e0468bf7af4d5ebf092e0483e0664885f1556..58010d6c5554ce773653bd0cf0c17f11480782d1 100644
--- a/ylong_http/src/body/text.rs
+++ b/ylong_http/src/body/text.rs
@@ -306,7 +306,7 @@ impl<T: async_impl::Body> async_impl::Body for TextBody<FromAsyncBody<T>> {
 /// assert_eq!(left, b"[REDUNDANT DATA]");
 /// ```
 pub struct TextBodyDecoder {
-    left: usize,
+    left: u64,
 }
 
 impl TextBodyDecoder {
@@ -321,7 +321,7 @@ impl TextBodyDecoder {
     ///
     /// let decoder = TextBodyDecoder::new(10);
     /// ```
-    pub fn new(length: usize) -> TextBodyDecoder {
+    pub fn new(length: u64) -> TextBodyDecoder {
         TextBodyDecoder { left: length }
     }
 
@@ -378,12 +378,13 @@ impl TextBodyDecoder {
             return (Text::complete(&buf[..0]), buf);
         }
 
-        let size = min(self.left, buf.len());
+        let size = min(self.left, buf.len() as u64);
         self.left -= size;
+        let end = size as usize;
         if self.left == 0 {
-            (Text::complete(&buf[..size]), &buf[size..])
+            (Text::complete(&buf[..end]), &buf[end..])
         } else {
-            (Text::partial(&buf[..size]), &buf[size..])
+            (Text::partial(&buf[..end]), &buf[end..])
         }
     }
 }
diff --git a/ylong_http_client/src/async_impl/conn/http2.rs b/ylong_http_client/src/async_impl/conn/http2.rs
index 94c755aad400027d48cc98d72fb154bf9330e63c..1d5bf3302f893092311a6633e06969d0bf836d44 100644
--- a/ylong_http_client/src/async_impl/conn/http2.rs
+++ b/ylong_http_client/src/async_impl/conn/http2.rs
@@ -144,7 +144,7 @@ where
                 .headers
                 .get("Content-Length")
                 .map(|v| v.to_str().unwrap_or(String::new()))
-                .and_then(|s| s.parse::<usize>().ok());
+                .and_then(|s| s.parse::<u64>().ok());
             match content_length {
                 None => HttpBody::empty(),
                 Some(0) => HttpBody::empty(),
diff --git a/ylong_http_client/src/async_impl/http_body.rs b/ylong_http_client/src/async_impl/http_body.rs
index 0acbb182d73722a600a12827869730de8f947be4..669f7377561fef6c3514c1a566b2b388f1cede09 100644
--- a/ylong_http_client/src/async_impl/http_body.rs
+++ b/ylong_http_client/src/async_impl/http_body.rs
@@ -99,7 +99,7 @@ impl HttpBody {
     }
 
     #[cfg(feature = "http2")]
-    pub(crate) fn text(len: usize, pre: &[u8], io: BoxStreamData) -> Self {
+    pub(crate) fn text(len: u64, pre: &[u8], io: BoxStreamData) -> Self {
         Self {
             kind: Kind::Text(Text::new(len, pre, io)),
             sleep: None,
@@ -283,7 +283,7 @@ struct Text {
 }
 
 impl Text {
-    pub(crate) fn new(len: usize, pre: &[u8], io: BoxStreamData) -> Self {
+    pub(crate) fn new(len: u64, pre: &[u8], io: BoxStreamData) -> Self {
         Self {
             decoder: TextBodyDecoder::new(len),
             pre: (!pre.is_empty()).then_some(Cursor::new(pre.to_vec())),
diff --git a/ylong_http_client/src/sync_impl/conn/http1.rs b/ylong_http_client/src/sync_impl/conn/http1.rs
index bfa41f7fcda02340131779d52a26b166d046ba8b..ef89318b47cd8fe91f65a4c3c2889d8aa0ab63c8 100644
--- a/ylong_http_client/src/sync_impl/conn/http1.rs
+++ b/ylong_http_client/src/sync_impl/conn/http1.rs
@@ -107,7 +107,7 @@ where
             .headers
             .get("Content-Length")
             .map(|v| v.to_str().unwrap_or_default())
-            .and_then(|s| s.parse::<usize>().ok());
+            .and_then(|s| s.parse::<u64>().ok());
 
         let is_trailer = part.headers.get("Trailer").is_some();
 
diff --git a/ylong_http_client/src/sync_impl/http_body.rs b/ylong_http_client/src/sync_impl/http_body.rs
index 37ecaa7128e7c83c25a65ecfa29f27a60fdd23a0..c7b13174b91713c1153f23a1dd71db43f6199a0b 100644
--- a/ylong_http_client/src/sync_impl/http_body.rs
+++ b/ylong_http_client/src/sync_impl/http_body.rs
@@ -57,7 +57,7 @@ impl HttpBody {
         Self { kind: Kind::Empty }
     }
 
-    pub(crate) fn text(len: usize, pre: &[u8], io: BoxStreamData) -> Self {
+    pub(crate) fn text(len: u64, pre: &[u8], io: BoxStreamData) -> Self {
         Self {
             kind: Kind::Text(Text::new(len, pre, io)),
         }
@@ -84,7 +84,7 @@ struct Text {
 }
 
 impl Text {
-    pub(crate) fn new(len: usize, pre: &[u8], io: BoxStreamData) -> Self {
+    pub(crate) fn new(len: u64, pre: &[u8], io: BoxStreamData) -> Self {
         Self {
             decoder: TextBodyDecoder::new(len),
             pre: (!pre.is_empty()).then_some(Cursor::new(pre.to_vec())),
diff --git a/ylong_http_client/src/util/normalizer.rs b/ylong_http_client/src/util/normalizer.rs
index d187489688c227bebccfcece4dce4abe5092df0b..13e432025347581ec2dfe4496003064b4faf1ebb 100644
--- a/ylong_http_client/src/util/normalizer.rs
+++ b/ylong_http_client/src/util/normalizer.rs
@@ -158,7 +158,7 @@ impl<'a> BodyLengthParser<'a> {
         if content_length.is_some() {
             let content_length_valid = content_length
                 .and_then(|v| v.to_str().ok())
-                .and_then(|s| s.parse::<usize>().ok());
+                .and_then(|s| s.parse::<u64>().ok());
 
             return match content_length_valid {
                 // If `content-length` is 0, the io stream cannot be read,
@@ -179,7 +179,7 @@ impl<'a> BodyLengthParser<'a> {
 pub(crate) enum BodyLength {
     #[cfg(feature = "http1_1")]
     Chunk,
-    Length(usize),
+    Length(u64),
     Empty,
     UntilClose,
 }