diff --git a/stopwatch/stopwatch.go b/stopwatch/stopwatch.go
new file mode 100644
index 0000000..b49681b
--- /dev/null
+++ b/stopwatch/stopwatch.go
@@ -0,0 +1,76 @@
+package stopwatch
+
+import (
+	"time"
+)
+
+type watch struct {
+	startTime time.Time
+	elapsed   time.Duration
+	isRunning bool
+}
+
+func StartNew() *watch {
+	w := &watch{}
+	w.Start()
+
+	return w
+}
+
+func (w *watch) Start() {
+	if !w.isRunning {
+		w.startTime = time.Now()
+		w.isRunning = true
+	}
+}
+
+// 将运行时间重置为零，并开始测量运行时间。
+func (w *watch) Restart() {
+	w.elapsed = 0
+	w.startTime = time.Now()
+	w.isRunning = true
+}
+
+// 停止时间间隔测量并将经过的时间重置为零。
+func (w *watch) Reset() {
+	w.elapsed = 0
+	w.startTime = time.Now()
+	w.isRunning = false
+}
+
+func (w *watch) Stop() {
+	if w.isRunning {
+		num := time.Since(w.startTime)
+		w.elapsed += num
+		w.isRunning = false
+
+		if w.elapsed < 0 {
+			w.elapsed = 0
+		}
+	}
+}
+
+func (w *watch) IsRunning() bool {
+	return w.isRunning
+}
+
+func (w *watch) Elapsed() time.Duration {
+	return time.Duration(w.ElapsedNanoseconds())
+}
+
+func (w *watch) ElapsedMilliseconds() int64 {
+	return w.ElapsedNanoseconds() / 1e6
+}
+
+func (w *watch) ElapsedMicroseconds() int64 {
+	return w.ElapsedNanoseconds() / 1e3
+}
+
+func (w *watch) ElapsedNanoseconds() int64 {
+	num := w.elapsed
+	if w.isRunning {
+		num += time.Since(w.startTime)
+	}
+
+	return num.Nanoseconds()
+}
diff --git a/stopwatch/stopwatch_test.go b/stopwatch/stopwatch_test.go
new file mode 100644
index 0000000..e267915
--- /dev/null
+++ b/stopwatch/stopwatch_test.go
@@ -0,0 +1,30 @@
+package stopwatch_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/charlienet/go-mixed/stopwatch"
+)
+
+func TestWatch(t *testing.T) {
+	watch := stopwatch.StartNew()
+
+	time.Sleep(time.Second * 3)
+	t.Log("Elapsed:", watch.Elapsed())
+	t.Log("Elapsed:", watch.ElapsedMilliseconds())
+	t.Log("Elapsed:", watch.ElapsedMicroseconds())
+	t.Log("Elapsed:", watch.ElapsedNanoseconds())
+
+	time.Sleep(time.Second * 1)
+	t.Log("Elapsed:", watch.Elapsed())
+
+	watch.Restart()
+	t.Log("Elapsed:", watch.Elapsed())
+	time.Sleep(time.Second * 1)
+	t.Log("Elapsed:", watch.Elapsed())
+
+	watch.Reset()
+
+	watch.Restart()
+}