diff --git a/g/container/gtype/bytes.go b/g/container/gtype/bytes.go
index a7cc89e86..fb067de5d 100644
--- a/g/container/gtype/bytes.go
+++ b/g/container/gtype/bytes.go
@@ -6,19 +6,16 @@
 
 package gtype
 
-import (
-    "sync"
-)
+import "sync/atomic"
 
 type Bytes struct {
-    mu  sync.RWMutex
-    val []byte
+    val atomic.Value
 }
 
 func NewBytes(value...[]byte) *Bytes {
     t := &Bytes{}
     if len(value) > 0 {
-        t.val = value[0]
+        t.val.Store(value[0])
     }
     return t
 }
@@ -28,14 +25,13 @@ func (t *Bytes) Clone() *Bytes {
 }
 
 func (t *Bytes) Set(value []byte) {
-    t.mu.Lock()
-    t.val = value
-    t.mu.Unlock()
+    t.val.Store(value)
 }
 
 func (t *Bytes) Val() []byte {
-    t.mu.RLock()
-    b := t.val
-    t.mu.RUnlock()
-    return b
+    s := t.val.Load()
+    if s != nil {
+        return s.([]byte)
+    }
+    return nil
 }
diff --git a/g/container/gtype/gtype_test.go b/g/container/gtype/gtype_test.go
index 1e79d19ee..736d064e5 100644
--- a/g/container/gtype/gtype_test.go
+++ b/g/container/gtype/gtype_test.go
@@ -197,13 +197,13 @@ func BenchmarkInterface_Val(b *testing.B) {
 }
 
 
-func BenchmarkAtomicString_Store(b *testing.B) {
+func BenchmarkAtomicValue_Store(b *testing.B) {
     for i := 0; i < b.N; i++ {
         at.Store(i)
     }
 }
 
-func BenchmarkAtomicString_Load(b *testing.B) {
+func BenchmarkAtomicValue_Load(b *testing.B) {
     for i := 0; i < b.N; i++ {
         at.Load()
     }
diff --git a/g/container/gtype/string.go b/g/container/gtype/string.go
index 998f38c8a..ede15a093 100644
--- a/g/container/gtype/string.go
+++ b/g/container/gtype/string.go
@@ -7,19 +7,19 @@
 package gtype
 
 import (
-    "sync"
+    "sync/atomic"
 )
 
 type String struct {
-    mu  sync.RWMutex
-    val string
+    val atomic.Value
 }
 
 func NewString(value...string) *String {
+    t := &String{}
     if len(value) > 0 {
-        return &String{val:value[0]}
+        t.val.Store(value[0])
     }
-    return &String{}
+    return t
 }
 
 func (t *String) Clone() *String {
@@ -27,16 +27,15 @@ func (t *String) Clone() *String {
 }
 
 func (t *String) Set(value string) {
-    t.mu.Lock()
-    t.val = value
-    t.mu.Unlock()
+    t.val.Store(value)
 }
 
 func (t *String) Val() string {
-    t.mu.RLock()
-    s := t.val
-    t.mu.RUnlock()
-    return s
+    s := t.val.Load()
+    if s != nil {
+        return s.(string)
+    }
+    return ""
 }