diff --git a/protocol/src/main/java/com/zfoo/protocol/buffer/ByteBufUtils.java b/protocol/src/main/java/com/zfoo/protocol/buffer/ByteBufUtils.java
index 9e938844..d5f4a20a 100644
--- a/protocol/src/main/java/com/zfoo/protocol/buffer/ByteBufUtils.java
+++ b/protocol/src/main/java/com/zfoo/protocol/buffer/ByteBufUtils.java
@@ -22,10 +22,7 @@ import io.netty.util.ReferenceCountUtil;
 import io.netty.util.collection.IntObjectHashMap;
 import io.netty.util.collection.LongObjectHashMap;
 
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
 
 /**
  * “可变长字节码算法”的压缩数据的算法，以达到压缩数据，减少磁盘IO。
@@ -420,7 +417,7 @@ public abstract class ByteBufUtils {
 
     public static List<IPacket> readPacketList(ByteBuf byteBuf, IProtocolRegistration protocolRegistration) {
         var length = readInt(byteBuf);
-        var list = new FixedSizeList<IPacket>(CollectionUtils.comfortableCapacity(length));
+        var list = new ArrayList<IPacket>(CollectionUtils.comfortableCapacity(length));
         for (var i = 0; i < length; i++) {
             list.set(i, (IPacket) protocolRegistration.read(byteBuf));
         }
@@ -1307,7 +1304,7 @@ public abstract class ByteBufUtils {
 
     public static List<String> readStringList(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var list = new FixedSizeList(CollectionUtils.comfortableCapacity(length));
+        var list = new ArrayList<String>(CollectionUtils.comfortableCapacity(length));
         for (var i = 0; i < length; i++) {
             list.set(i, readString(byteBuf));
         }
diff --git a/protocol/src/main/java/com/zfoo/protocol/collection/FixedSizeList.java b/protocol/src/main/java/com/zfoo/protocol/collection/FixedSizeList.java
deleted file mode 100644
index ae14e502..00000000
--- a/protocol/src/main/java/com/zfoo/protocol/collection/FixedSizeList.java
+++ /dev/null
@@ -1,151 +0,0 @@
-/*
- * Copyright (C) 2020 The zfoo Authors
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
- * in compliance with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
- * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and limitations under the License.
- */
-
-package com.zfoo.protocol.collection;
-
-import java.util.Collection;
-import java.util.Iterator;
-import java.util.List;
-import java.util.ListIterator;
-
-/**
- * 初始化就确定了大小的List，不可添加和删除，但是可以set，就像一个数组一样
- *
- * @author godotg
- * @version 3.0
- */
-public class FixedSizeList<E> implements List<E> {
-
-    private final Object[] array;
-
-    public FixedSizeList(int initialCapacity) {
-        this.array = new Object[initialCapacity];
-    }
-
-    @Override
-    public int size() {
-        return array.length;
-    }
-
-    @Override
-    public boolean isEmpty() {
-        return ArrayUtils.isEmpty(array);
-    }
-
-    @Override
-    public E get(int index) {
-        return (E) array[index];
-    }
-
-    @Override
-    public E set(int index, E ele) {
-        var old = array[index];
-        array[index] = ele;
-        return (E) old;
-    }
-
-    @Override
-    public boolean contains(Object ele) {
-        return ArrayUtils.toList(array).stream().anyMatch(it -> ele.equals(it));
-    }
-
-    @Override
-    public Object[] toArray() {
-        return ArrayUtils.toList(array).toArray();
-    }
-
-    @Override
-    public <T> T[] toArray(T[] arrays) {
-        ArrayUtils.toList(array).toArray(arrays);
-        return arrays;
-    }
-
-    @Override
-    public boolean containsAll(Collection<?> collection) {
-        return ArrayUtils.toList(array).containsAll(collection);
-    }
-
-    @Override
-    public int indexOf(Object ele) {
-        return ArrayUtils.toList(array).indexOf(ele);
-    }
-
-    @Override
-    public int lastIndexOf(Object ele) {
-        return ArrayUtils.toList(array).lastIndexOf(ele);
-    }
-
-    @Override
-    public Iterator<E> iterator() {
-        return (Iterator<E>) ArrayUtils.toList(array).iterator();
-    }
-
-    @Override
-    public ListIterator<E> listIterator() {
-        return (ListIterator<E>) ArrayUtils.toList(array).listIterator();
-    }
-
-    @Override
-    public ListIterator<E> listIterator(int index) {
-        return (ListIterator<E>) ArrayUtils.toList(array).listIterator(index);
-    }
-
-    @Override
-    public List<E> subList(int fromIndex, int toIndex) {
-        return (List<E>) ArrayUtils.toList(array).subList(fromIndex, toIndex);
-    }
-
-    @Override
-    public boolean add(E e) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void add(int index, E element) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean addAll(Collection<? extends E> collection) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean addAll(int index, Collection<? extends E> collection) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean remove(Object o) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public E remove(int index) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean removeAll(Collection<?> collection) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean retainAll(Collection<?> collection) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void clear() {
-        throw new UnsupportedOperationException();
-    }
-}