diff --git a/sync/atomic.go b/sync/atomic.go
index 7905807..67240fe 100644
--- a/sync/atomic.go
+++ b/sync/atomic.go
@@ -1,5 +1,28 @@
 package main
 
-func main() {
+import (
+	"fmt"
+	"sync"
+	"sync/atomic"
+)
 
+var a int64 //并发修改a变量的值，可能会导致数字错误
+var WG sync.WaitGroup
+
+//var mLock sync.Mutex //方法1,添加互斥锁
+
+func main() {
+	for i := 0; i < 1000; i++ {
+		WG.Add(1)
+		go func() {
+			//mLock.Lock() //加锁
+			//a++ //加法操作
+			atomic.AddInt64(&a, 1) //传递全局变量指针,和要加的值,默认就是加锁和释放锁
+			//mLock.Unlock() //解锁
+			WG.Done()
+		}()
+
+	}
+	WG.Wait()
+	fmt.Println(a)
 }