diff --git a/collections/linked_list.go b/collections/linked_list.go
index a3f0042..7068116 100644
--- a/collections/linked_list.go
+++ b/collections/linked_list.go
@@ -1,38 +1,203 @@
 package collections
 
-type Item[T any] interface {
-	Less(T) bool
-}
+import (
+	"fmt"
+
+	"github.com/charlienet/go-mixed/locker"
+)
 
 // 单链表节点
-type linkedNode[T Item[T]] struct {
+type linkedNode[T any] struct {
 	item T
 	next *linkedNode[T]
 }
 
 // 双向链接节点
-type doubleLinkedNode[T Item[T]] struct {
+type doubleLinkedNode[T any] struct {
 	item T
 	prev *linkedNode[T]
 	next *linkedNode[T]
 }
 
-type LinkedList[T Item[T]] struct {
+type LinkedList[T any] struct {
+	mu         locker.RWLocker
 	head, tail *linkedNode[T]
 	size       int
 }
 
 // 初始化单向链表
-func NewLinkedList[T Item[T]]() *LinkedList[T] {
-	return &LinkedList[T]{}
+func NewLinkedList[T any](vals ...T) *LinkedList[T] {
+	l := &LinkedList[T]{mu: locker.EmptyLocker}
+	l.Append(vals...)
+
+	return l
 }
 
-type DLinkedList[T Item[T]] struct {
+// synchronized
+func (l *LinkedList[T]) Synchronize() {
+	l.mu = locker.NewRWLocker()
+}
+
+func (l *LinkedList[T]) Append(vals ...T) {
+	for _, v := range vals {
+		l.append(v)
+	}
+}
+
+// prepend will prepend the list with a value, the reference node is Returned
+func (l *LinkedList[T]) Prepend(vals ...T) {
+	for _, v := range vals {
+		l.prepend(v)
+	}
+}
+
+func (l *LinkedList[T]) append(v T) {
+	n := createSingleNode(v)
+
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	if l.head == nil {
+		l.head = n
+	}
+
+	if l.tail != nil {
+		l.tail.next = n
+	}
+
+	l.tail = n
+	l.size++
+}
+
+func (l *LinkedList[T]) prepend(v T) {
+	n := createSingleNode(v)
+
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	if l.head != nil {
+		n.next = l.head
+	}
+
+	if l.tail == nil {
+		l.tail = n
+	}
+
+	l.head = n
+	l.size++
+}
+
+func (l *LinkedList[T]) PushHead() {
+}
+
+func (l *LinkedList[T]) PushTail() {
+
+}
+
+func (l *LinkedList[T]) Exist(v T) bool {
+	ret := false
+	l.ForEach(func(t T) bool {
+		// if t == v {
+		// 	ret = true
+		// 	return true
+		// }
+
+		return false
+	})
+
+	return ret
+}
+
+func (l *LinkedList[T]) RemoveAt(index int) {
+	var i int
+	var prev *linkedNode[T]
+
+	prev = l.head
+	for current := l.head; current != nil; {
+
+		if i == index {
+			prev.next = current.next
+			current.next = nil
+
+			l.size--
+			return
+		}
+
+		prev = current
+		current = current.next
+		i++
+	}
+}
+
+func (l *LinkedList[T]) IsEmpty() bool {
+	return l.size == 0
+}
+
+func (l *LinkedList[T]) Size() int {
+	return l.size
+}
+
+func (l *LinkedList[T]) GetAt(i int) T {
+	if i <= l.Size() {
+		var n int
+		for current := l.head; current != nil; current = current.next {
+			if n == i {
+				return current.item
+			}
+			n++
+		}
+	}
+
+	return *new(T)
+}
+
+func (l *LinkedList[T]) ForEach(fn func(T) bool) {
+	for current := l.head; current != nil; current = current.next {
+		if fn(current.item) {
+			break
+		}
+	}
+}
+
+func (l *LinkedList[T]) Clear() {
+	l.head = nil
+	l.tail = nil
+	l.size = 0
+}
+
+func (l *LinkedList[T]) ToList() []T {
+	ret := make([]T, 0, l.size)
+	l.ForEach(func(t T) bool {
+		ret = append(ret, t)
+		return false
+	})
+
+	return ret
+}
+
+func (l *LinkedList[T]) String() string {
+	return fmt.Sprint(l.ToList())
+}
+
+func (l *LinkedList[T]) remove(n *linkedNode[T]) {
+	n.next = nil
+	l.size--
+}
+
+type DLinkedList[T any] struct {
 	head, tail *doubleLinkedNode[T]
 	size       int
 }
 
 // 初始化双向链表
-func NewDoubleLinkedLis[T Item[T]]() *DLinkedList[T] {
+func NewDoubleLinkedLis[T any]() *DLinkedList[T] {
 	return &DLinkedList[T]{}
 }
+
+func createSingleNode[T any](v T) *linkedNode[T] {
+	return &linkedNode[T]{item: v}
+}
+
+func createDoubleNode[T any](v T) *doubleLinkedNode[T] {
+	return &doubleLinkedNode[T]{item: v}
+}
diff --git a/collections/linked_list_test.go b/collections/linked_list_test.go
new file mode 100644
index 0000000..5b153dc
--- /dev/null
+++ b/collections/linked_list_test.go
@@ -0,0 +1,36 @@
+package collections
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewLinkdList(t *testing.T) {
+	l := NewLinkedList(1, 2, 3, 4, 5)
+
+	l.Append(55)
+	t.Log(l)
+
+	t.Log(NewLinkedList("a", "b", "c", "d"))
+}
+
+func TestLinkedListSize(t *testing.T) {
+	ll := NewLinkedList[int]()
+
+	ll.Append(5)
+	ll.Append(6)
+	ll.Append(7)
+
+	assert.Equal(t, 3, ll.Size())
+
+	ll.Prepend(8, 9, 10)
+	assert.Equal(t, 6, ll.Size())
+
+	ll.RemoveAt(1)
+	assert.Equal(t, 5, ll.Size())
+	t.Log(ll)
+
+	ll.RemoveAt(ll.Size() - 1)
+	t.Log(ll)
+}
diff --git a/collections/options.go b/collections/options.go
new file mode 100644
index 0000000..2cbef0d
--- /dev/null
+++ b/collections/options.go
@@ -0,0 +1,11 @@
+package collections
+
+import "github.com/charlienet/go-mixed/locker"
+
+type options struct {
+	mu locker.RWLocker
+}
+
+func emptyLocker() locker.RWLocker {
+	return locker.EmptyLocker
+}