diff --git a/listhead.go b/listhead.go
index baba1d9..d192eb8 100644
--- a/listhead.go
+++ b/listhead.go
@@ -104,3 +104,9 @@ func MakeListHead () *ListHead{
 	l.Init(nil)
 	return l
 }
+
+func NewListHead () *ListHead{
+	l := new(ListHead)
+	l.Init(nil)
+	return l
+}
diff --git a/sysutils.go b/sysutils.go
index 969800d..17eb523 100644
--- a/sysutils.go
+++ b/sysutils.go
@@ -130,7 +130,3 @@ func FormatUnixDateEx(sec int64) string {
 	strTime := time.Unix(sec, 0).Format("20060102")
 	return strTime
 }
-
-func TraverseSlice[T any](arr []T, cb func (T)) {
-
-}
diff --git a/uuid.go b/uuid.go
new file mode 100644
index 0000000..d1ecc76
--- /dev/null
+++ b/uuid.go
@@ -0,0 +1,51 @@
+package q5
+
+import (
+	"fmt"
+	"time"
+)
+
+const Q5_EPOCH = 1419120000000;
+
+const MACHINE_ID_BIT_NUM = 12
+const SEQUNCE_ID_BIT_NUM = 10
+const MAX_MACHINE_ID = (1 << MACHINE_ID_BIT_NUM) - 1
+const MAX_SEQUNCE_ID = (1 << SEQUNCE_ID_BIT_NUM) - 1
+
+type Uuid struct {
+	machineId int32
+	sequenceId int32
+	lastGenerateTick int64
+}
+
+func (this *Uuid) Generate() int64 {
+	var value int64
+	tick := GetTickCount()
+	if tick == this.lastGenerateTick {
+		this.sequenceId++
+		if this.sequenceId >= MAX_SEQUNCE_ID {
+			for tick <= this.lastGenerateTick {
+				time.Sleep(time.Millisecond * 1)
+				tick = GetTickCount()
+			}
+			this.sequenceId = 0
+		}
+	} else {
+		this.sequenceId = 0
+	}
+	this.lastGenerateTick = tick
+	// 保留后41位时间
+	value = (tick - Q5_EPOCH) << 22
+	//中间12位是机器ID
+	value |= int64((int64(this.machineId) & int64(MAX_MACHINE_ID)) << SEQUNCE_ID_BIT_NUM)
+	//最后10位是sequenceID
+	value |= int64(this.sequenceId & MAX_SEQUNCE_ID)
+	return value
+}
+
+func (this *Uuid) SetMachineId(macId int32) {
+	if macId > MAX_MACHINE_ID || macId < 1 {
+		panic(fmt.Sprintf("Uuid.SetMachineId error %d", macId))
+	}
+	this.machineId = macId
+}