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 12dc3408..bbf882b3 100644
--- a/protocol/src/main/java/com/zfoo/protocol/buffer/ByteBufUtils.java
+++ b/protocol/src/main/java/com/zfoo/protocol/buffer/ByteBufUtils.java
@@ -430,7 +430,7 @@ public abstract class ByteBufUtils {
 
     public static Set<IPacket> readPacketSet(ByteBuf byteBuf, IProtocolRegistration protocolRegistration) {
         var length = readInt(byteBuf);
-        var set = (Set<IPacket>) CollectionUtils.newFixedSet(length);
+        var set = (Set<IPacket>) CollectionUtils.newSet(length);
         for (var i = 0; i < length; i++) {
             set.add((IPacket) protocolRegistration.read(byteBuf));
         }
@@ -619,7 +619,7 @@ public abstract class ByteBufUtils {
 
     public static Map<String, Integer> readStringIntMap(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var map = (Map<String, Integer>) CollectionUtils.newFixedMap(length);
+        var map = (Map<String, Integer>) CollectionUtils.newMap(length);
         for (var i = 0; i < length; i++) {
             map.put(readString(byteBuf), readIntBox(byteBuf));
         }
@@ -640,7 +640,7 @@ public abstract class ByteBufUtils {
 
     public static Map<String, Long> readStringLongMap(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var map = (Map<String, Long>) CollectionUtils.newFixedMap(length);
+        var map = (Map<String, Long>) CollectionUtils.newMap(length);
         for (var i = 0; i < length; i++) {
             map.put(readString(byteBuf), readLongBox(byteBuf));
         }
@@ -661,7 +661,7 @@ public abstract class ByteBufUtils {
 
     public static Map<String, String> readStringStringMap(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var map = (Map<String, String>) CollectionUtils.newFixedMap(length);
+        var map = (Map<String, String>) CollectionUtils.newMap(length);
         for (var i = 0; i < length; i++) {
             map.put(readString(byteBuf), readString(byteBuf));
         }
@@ -682,7 +682,7 @@ public abstract class ByteBufUtils {
 
     public static Map<String, IPacket> readStringPacketMap(ByteBuf byteBuf, IProtocolRegistration protocolRegistration) {
         var length = readInt(byteBuf);
-        var map = (Map<String, IPacket>) CollectionUtils.newFixedMap(length);
+        var map = (Map<String, IPacket>) CollectionUtils.newMap(length);
         for (var i = 0; i < length; i++) {
             map.put(readString(byteBuf), (IPacket) protocolRegistration.read(byteBuf));
         }
@@ -760,7 +760,7 @@ public abstract class ByteBufUtils {
 
     public static Set<Boolean> readBooleanSet(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var set = (Set<Boolean>) CollectionUtils.newFixedSet(length);
+        var set = (Set<Boolean>) CollectionUtils.newSet(length);
         for (var i = 0; i < length; i++) {
             set.add(readBooleanBox(byteBuf));
         }
@@ -1143,7 +1143,7 @@ public abstract class ByteBufUtils {
 
     public static Set<Float> readFloatSet(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var set = (Set<Float>) CollectionUtils.newFixedSet(length);
+        var set = (Set<Float>) CollectionUtils.newSet(length);
         for (var i = 0; i < length; i++) {
             set.add(readFloatBox(byteBuf));
         }
@@ -1224,7 +1224,7 @@ public abstract class ByteBufUtils {
 
     public static Set<Double> readDoubleSet(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var set = (Set<Double>) CollectionUtils.newFixedSet(length);
+        var set = (Set<Double>) CollectionUtils.newSet(length);
         for (var i = 0; i < length; i++) {
             set.add(readDoubleBox(byteBuf));
         }
@@ -1282,7 +1282,7 @@ public abstract class ByteBufUtils {
 
     public static Set<String> readStringSet(ByteBuf byteBuf) {
         var length = readInt(byteBuf);
-        var set = (Set<String>) CollectionUtils.newFixedSet(length);
+        var set = (Set<String>) CollectionUtils.newSet(length);
         for (var i = 0; i < length; i++) {
             set.add(readString(byteBuf));
         }
diff --git a/protocol/src/main/java/com/zfoo/protocol/collection/CollectionUtils.java b/protocol/src/main/java/com/zfoo/protocol/collection/CollectionUtils.java
index 6ece1398..52633eba 100644
--- a/protocol/src/main/java/com/zfoo/protocol/collection/CollectionUtils.java
+++ b/protocol/src/main/java/com/zfoo/protocol/collection/CollectionUtils.java
@@ -75,18 +75,15 @@ public abstract class CollectionUtils {
     }
 
 
-    /**
-     * 固定大小集合，如果初始化容量为0，则后续无法继续增加集合容量
-     */
-    public static List<?> newFixedList(int size) {
-        return size <= 0 ? Collections.EMPTY_LIST : new ArrayList<>(size);
+    public static List<?> newList(int size) {
+        return size <= 0 ? Collections.EMPTY_LIST : new ArrayList<>(comfortableLength(size));
     }
 
-    public static Set<?> newFixedSet(int size) {
+    public static Set<?> newSet(int size) {
         return size <= 0 ? Collections.EMPTY_SET : new HashSet<>(comfortableCapacity(size));
     }
 
-    public static Map<?, ?> newFixedMap(int size) {
+    public static Map<?, ?> newMap(int size) {
         return size <= 0 ? Collections.EMPTY_MAP : new HashMap<>(comfortableCapacity(size));
     }
 
diff --git a/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceListSerializer.java b/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceListSerializer.java
index 2880dfc1..429bf3ed 100644
--- a/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceListSerializer.java
+++ b/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceListSerializer.java
@@ -67,7 +67,7 @@ public class EnhanceListSerializer implements IEnhanceSerializer {
         var size = "size" + GenerateProtocolFile.index.getAndIncrement();
         builder.append(StringUtils.format("int {}={}.readInt($1);", size, EnhanceUtils.byteBufUtils));
 
-        builder.append(StringUtils.format("List {} = CollectionUtils.newFixedList({});", list, size));
+        builder.append(StringUtils.format("List {} = CollectionUtils.newList({});", list, size));
 
         var i = "i" + GenerateProtocolFile.index.getAndIncrement();
 
diff --git a/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceMapSerializer.java b/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceMapSerializer.java
index 618e3d26..a6c33238 100644
--- a/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceMapSerializer.java
+++ b/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceMapSerializer.java
@@ -80,7 +80,7 @@ public class EnhanceMapSerializer implements IEnhanceSerializer {
 
         var size = "size" + GenerateProtocolFile.index.getAndIncrement();
         builder.append(StringUtils.format("int {}={}.readInt($1);", size, EnhanceUtils.byteBufUtils));
-        builder.append(StringUtils.format("Map {} = CollectionUtils.newFixedMap({});", map, size));
+        builder.append(StringUtils.format("Map {} = CollectionUtils.newMap({});", map, size));
 
         var i = "i" + GenerateProtocolFile.index.getAndIncrement();
         builder.append(StringUtils.format("for(int {}=0; {}<{}; {}++){", i, i, size, i));
diff --git a/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceSetSerializer.java b/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceSetSerializer.java
index 04360286..5733f31b 100644
--- a/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceSetSerializer.java
+++ b/protocol/src/main/java/com/zfoo/protocol/serializer/enhance/EnhanceSetSerializer.java
@@ -65,7 +65,7 @@ public class EnhanceSetSerializer implements IEnhanceSerializer {
 
         var size = "size" + GenerateProtocolFile.index.getAndIncrement();
         builder.append(StringUtils.format("int {} = {}.readInt($1);", size, EnhanceUtils.byteBufUtils));
-        builder.append(StringUtils.format("Set {} = CollectionUtils.newFixedSet({});", set, size));
+        builder.append(StringUtils.format("Set {} = CollectionUtils.newSet({});", set, size));
 
         var i = "i" + GenerateProtocolFile.index.getAndIncrement();
         builder.append(StringUtils.format("for(int {}=0; {}<{}; {}++){", i, i, size, i));