diff --git a/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/plugin/common/StandardMessageCodec.ets b/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/plugin/common/StandardMessageCodec.ets
index 33ad31db904f7f1a00c5c3984a12785effc31689..d9df49cee8388c6adebc1dfffbf8ce1c0bd85d50 100644
--- a/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/plugin/common/StandardMessageCodec.ets
+++ b/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/plugin/common/StandardMessageCodec.ets
@@ -217,13 +217,13 @@ export default class StandardMessageCodec implements MessageCodec<Any> {
 
     writeSize(stream: ByteBuffer, value: number) {
         if (value < 254) {
-            stream.writeInt8(value);
+            stream.writeUint8(value);
         } else if (value <= 0xffff) {
-            stream.writeInt8(254);
-            stream.writeInt16(value, true);
+            stream.writeUint8(254);
+            stream.writeUint16(value, true);
         } else {
-            stream.writeInt8(255);
-            stream.writeInt32(value, true);
+            stream.writeUint8(255);
+            stream.writeUint32(value, true);
         }
     }
 
@@ -233,13 +233,13 @@ export default class StandardMessageCodec implements MessageCodec<Any> {
     }
 
     readSize(buffer: ByteBuffer) {
-        let value = buffer.readInt8() & 0xff;
+        let value = buffer.readUint8() & 0xff;
         if (value < 254) {
             return value;
         } else if (value == 254) {
             return buffer.readUint16(true);
         } else {
-            return buffer.readInt32(true);
+            return buffer.readUint32(true);
         }
     }
 
@@ -257,10 +257,9 @@ export default class StandardMessageCodec implements MessageCodec<Any> {
 
     readBytes(buffer: ByteBuffer): Uint8Array {
         let length = this.readSize(buffer);
-        let bytes = new Uint8Array(length)
-        for (let i = 0; i < length; i++) {
-            bytes[i] = buffer.readUint8()
-        }
+        let bytesBuffer = new ArrayBuffer(length);
+        let bytes = new Uint8Array(bytesBuffer);
+        bytes.set(buffer.readUint8Array(length));
         return bytes;
     }
 
diff --git a/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/ByteBuffer.ets b/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/ByteBuffer.ets
index 57193e339a90805271c4bb24f091ee4d379331f9..e7cc1d3ac24f31d8f32bd64190819fee1ae57817 100644
--- a/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/ByteBuffer.ets
+++ b/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/ByteBuffer.ets
@@ -116,7 +116,11 @@ export class ByteBuffer {
    */
   checkWriteCapacity(slen: number): void {
     if (this.mByteOffset + slen > this.dataView!.byteLength) {
-      let newBuffer = new ArrayBuffer(this.dataView!.byteLength + slen + 512);
+      let newCapacity = this.dataView!.byteLength + (this.dataView!.byteLength >> 1);
+      if (newCapacity < this.dataView!.byteLength + slen + 512) {
+        newCapacity = this.dataView!.byteLength + slen + 512;
+      }
+      let newBuffer = new ArrayBuffer(newCapacity);
       let newDataView = new DataView(newBuffer);
       let oldUint8Array = new Uint8Array(this.dataView!.buffer);
       let newUint8Array = new Uint8Array(newBuffer);
diff --git a/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/StringUtils.ets b/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/StringUtils.ets
index a9344782075002c1968da4b8b23c982b9553b944..62c730aa6b35d907934f4035b38802681224a6fd 100644
--- a/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/StringUtils.ets
+++ b/shell/platform/ohos/flutter_embedding/flutter/src/main/ets/util/StringUtils.ets
@@ -19,28 +19,28 @@ import util from '@ohos.util'
  * 默认字符串工具
  */
 export default class StringUtils {
+  static TEXT_ENCODER = new util.TextEncoder("utf-8");
+  static TEXT_DECODER = util.TextDecoder.create('utf-8', { ignoreBOM : true });
+
   static stringToArrayBuffer(str: string): ArrayBuffer {
     if(str.length == 0){
       return new ArrayBuffer(0);
     }
-    let textEncoder = new util.TextEncoder("utf-8");
-    return textEncoder.encodeInto(str).buffer;
+    return StringUtils.TEXT_ENCODER.encodeInto(str).buffer;
   }
 
   static arrayBufferToString(buffer: ArrayBuffer): string {
     if (buffer.byteLength <= 0) {
       return "";
     }
-    let textDecoder = util.TextDecoder.create('utf-8', { ignoreBOM : true })
-    return textDecoder.decode(new Uint8Array(buffer));
+    return StringUtils.TEXT_DECODER.decodeWithStream(new Uint8Array(buffer));
   }
 
   static uint8ArrayToString(buffer: Uint8Array): string {
     if (buffer.length <= 0) {
       return "";
     }
-    let textDecoder = util.TextDecoder.create('utf-8', { ignoreBOM : true })
-    return textDecoder.decodeWithStream(buffer);
+    return StringUtils.TEXT_DECODER.decodeWithStream(buffer);
   }
 
   static isNotEmpty(str: string): boolean {