diff --git a/internal/utils/maps/map_fixed.go b/internal/utils/maps/map_fixed.go
new file mode 100644
index 0000000..6c71a21
--- /dev/null
+++ b/internal/utils/maps/map_fixed.go
@@ -0,0 +1,78 @@
+// Copyright 2023 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package maputils
+
+import "sync"
+
+type KeyType interface {
+	string | int | int64 | int32 | uint64 | uint32
+}
+
+type ValueType interface {
+	any
+}
+
+// FixedMap
+// TODO 解决已存在元素不能按顺序弹出的问题
+type FixedMap[KeyT KeyType, ValueT ValueType] struct {
+	m    map[KeyT]ValueT
+	keys []KeyT
+
+	maxSize int
+	locker  sync.RWMutex
+}
+
+func NewFixedMap[KeyT KeyType, ValueT ValueType](maxSize int) *FixedMap[KeyT, ValueT] {
+	return &FixedMap[KeyT, ValueT]{
+		maxSize: maxSize,
+		m:       map[KeyT]ValueT{},
+	}
+}
+
+func (this *FixedMap[KeyT, ValueT]) Put(key KeyT, value ValueT) {
+	this.locker.Lock()
+	defer this.locker.Unlock()
+
+	if this.maxSize <= 0 {
+		return
+	}
+
+	_, exists := this.m[key]
+	this.m[key] = value
+
+	if !exists {
+		this.keys = append(this.keys, key)
+
+		if len(this.keys) > this.maxSize {
+			var firstKey = this.keys[0]
+			this.keys = this.keys[1:]
+			delete(this.m, firstKey)
+		}
+	}
+}
+
+func (this *FixedMap[KeyT, ValueT]) Get(key KeyT) (value ValueT, ok bool) {
+	this.locker.RLock()
+	defer this.locker.RUnlock()
+	value, ok = this.m[key]
+	return
+}
+
+func (this *FixedMap[KeyT, ValueT]) Has(key KeyT) bool {
+	this.locker.RLock()
+	defer this.locker.RUnlock()
+	_, ok := this.m[key]
+	return ok
+}
+
+func (this *FixedMap[KeyT, ValueT]) Keys() []KeyT {
+	this.locker.RLock()
+	defer this.locker.RUnlock()
+	return this.keys
+}
+
+func (this *FixedMap[KeyT, ValueT]) RawMap() map[KeyT]ValueT {
+	this.locker.RLock()
+	defer this.locker.RUnlock()
+	return this.m
+}
diff --git a/internal/utils/maps/map_fixed_test.go b/internal/utils/maps/map_fixed_test.go
new file mode 100644
index 0000000..545263b
--- /dev/null
+++ b/internal/utils/maps/map_fixed_test.go
@@ -0,0 +1,26 @@
+// Copyright 2023 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package maputils_test
+
+import (
+	maputils "github.com/TeaOSLab/EdgeNode/internal/utils/maps"
+	"testing"
+)
+
+func TestNewFixedMap(t *testing.T) {
+	var m = maputils.NewFixedMap[string, int](3)
+	m.Put("a", 1)
+	t.Log(m.RawMap())
+	t.Log(m.Get("a"))
+	t.Log(m.Get("b"))
+
+	m.Put("b", 2)
+	m.Put("c", 3)
+	t.Log(m.RawMap(), m.Keys())
+
+	m.Put("d", 4)
+	t.Log(m.RawMap(), m.Keys())
+
+	m.Put("b", 200)
+	t.Log(m.RawMap(), m.Keys())
+}
diff --git a/internal/utils/sets/set_fixed.go b/internal/utils/sets/set_fixed.go
index 9a1e189..71287b8 100644
--- a/internal/utils/sets/set_fixed.go
+++ b/internal/utils/sets/set_fixed.go
@@ -7,6 +7,8 @@ import (
 	"sync"
 )
 
+// FixedSet
+// TODO 解决已存在元素不能按顺序弹出的问题
 type FixedSet struct {
 	maxSize int
 	locker  sync.RWMutex