diff --git a/container/gtype/bool.go b/container/gtype/bool.go
index d2ee9c0dc..0c52d0352 100644
--- a/container/gtype/bool.go
+++ b/container/gtype/bool.go
@@ -59,3 +59,12 @@ func (v *Bool) Cas(old, new bool) bool {
 	}
 	return atomic.CompareAndSwapInt32(&v.value, oldInt32, newInt32)
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Bool) MarshalJSON() ([]byte, error) {
+	if v.Val() {
+		return []byte("true"), nil
+	} else {
+		return []byte("false"), nil
+	}
+}
diff --git a/container/gtype/byte.go b/container/gtype/byte.go
index bd61f8576..1a6c27baf 100644
--- a/container/gtype/byte.go
+++ b/container/gtype/byte.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Byte) Add(delta byte) (new byte) {
 func (v *Byte) Cas(old, new byte) bool {
 	return atomic.CompareAndSwapInt32(&v.value, int32(old), int32(new))
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Byte) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatUint(uint64(v.Val()), 10)), nil
+}
diff --git a/container/gtype/bytes.go b/container/gtype/bytes.go
index 4476b3d85..997f16dc5 100644
--- a/container/gtype/bytes.go
+++ b/container/gtype/bytes.go
@@ -6,7 +6,11 @@
 
 package gtype
 
-import "sync/atomic"
+import (
+	"encoding/base64"
+	"github.com/gogf/gf/util/gconv"
+	"sync/atomic"
+)
 
 type Bytes struct {
 	value atomic.Value
@@ -42,3 +46,11 @@ func (v *Bytes) Val() []byte {
 	}
 	return nil
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Bytes) MarshalJSON() ([]byte, error) {
+	val := v.Val()
+	dst := make([]byte, base64.StdEncoding.EncodedLen(len(val)))
+	base64.StdEncoding.Encode(dst, val)
+	return gconv.UnsafeStrToBytes(`"` + gconv.UnsafeBytesToStr(dst) + `"`), nil
+}
diff --git a/container/gtype/float32.go b/container/gtype/float32.go
index 2b3759992..14045ff6a 100644
--- a/container/gtype/float32.go
+++ b/container/gtype/float32.go
@@ -7,7 +7,9 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
 	"math"
+	"strconv"
 	"sync/atomic"
 	"unsafe"
 )
@@ -62,3 +64,8 @@ func (v *Float32) Add(delta float32) (new float32) {
 func (v *Float32) Cas(old, new float32) bool {
 	return atomic.CompareAndSwapUint32(&v.value, uint32(old), uint32(new))
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Float32) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatFloat(float64(v.Val()), 'f', -1, 32)), nil
+}
diff --git a/container/gtype/float64.go b/container/gtype/float64.go
index e720c5e59..aeb73976a 100644
--- a/container/gtype/float64.go
+++ b/container/gtype/float64.go
@@ -7,7 +7,9 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
 	"math"
+	"strconv"
 	"sync/atomic"
 	"unsafe"
 )
@@ -62,3 +64,8 @@ func (v *Float64) Add(delta float64) (new float64) {
 func (v *Float64) Cas(old, new float64) bool {
 	return atomic.CompareAndSwapUint64(&v.value, uint64(old), uint64(new))
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Float64) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatFloat(v.Val(), 'f', -1, 64)), nil
+}
diff --git a/container/gtype/gtype.go b/container/gtype/gtype.go
index 0b5804ffb..795d36beb 100644
--- a/container/gtype/gtype.go
+++ b/container/gtype/gtype.go
@@ -7,8 +7,10 @@
 // Package gtype provides kinds of high performance and concurrent-safe basic variable types.
 package gtype
 
+// Type is alias of Interface.
 type Type = Interface
 
+// New is alias of NewInterface.
 // See NewInterface.
 func New(value ...interface{}) *Type {
 	return NewInterface(value...)
diff --git a/container/gtype/int.go b/container/gtype/int.go
index 984268b89..d6d6acad5 100644
--- a/container/gtype/int.go
+++ b/container/gtype/int.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Int) Add(delta int) (new int) {
 func (v *Int) Cas(old, new int) bool {
 	return atomic.CompareAndSwapInt64(&v.value, int64(old), int64(new))
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Int) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.Itoa(v.Val())), nil
+}
diff --git a/container/gtype/int32.go b/container/gtype/int32.go
index 9c6407625..e102f8cc3 100644
--- a/container/gtype/int32.go
+++ b/container/gtype/int32.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Int32) Add(delta int32) (new int32) {
 func (v *Int32) Cas(old, new int32) bool {
 	return atomic.CompareAndSwapInt32(&v.value, old, new)
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Int32) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.Itoa(int(v.Val()))), nil
+}
diff --git a/container/gtype/int64.go b/container/gtype/int64.go
index 6c961efb1..1faaa9083 100644
--- a/container/gtype/int64.go
+++ b/container/gtype/int64.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Int64) Add(delta int64) (new int64) {
 func (v *Int64) Cas(old, new int64) bool {
 	return atomic.CompareAndSwapInt64(&v.value, old, new)
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Int64) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatInt(v.Val(), 10)), nil
+}
diff --git a/container/gtype/interface.go b/container/gtype/interface.go
index 92a5ce35f..e262ea846 100644
--- a/container/gtype/interface.go
+++ b/container/gtype/interface.go
@@ -7,6 +7,7 @@
 package gtype
 
 import (
+	"encoding/json"
 	"sync/atomic"
 )
 
@@ -41,3 +42,8 @@ func (v *Interface) Set(value interface{}) (old interface{}) {
 func (v *Interface) Val() interface{} {
 	return v.value.Load()
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Interface) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.Val())
+}
diff --git a/container/gtype/string.go b/container/gtype/string.go
index 7fe9986bd..b7dfd0da0 100644
--- a/container/gtype/string.go
+++ b/container/gtype/string.go
@@ -7,6 +7,7 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
 	"sync/atomic"
 )
 
@@ -44,3 +45,8 @@ func (v *String) Val() string {
 	}
 	return ""
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *String) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(`"` + v.Val() + `"`), nil
+}
diff --git a/container/gtype/uint.go b/container/gtype/uint.go
index 3a07e0254..ad0ea65d8 100644
--- a/container/gtype/uint.go
+++ b/container/gtype/uint.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Uint) Add(delta uint) (new uint) {
 func (v *Uint) Cas(old, new uint) bool {
 	return atomic.CompareAndSwapUint64(&v.value, uint64(old), uint64(new))
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Uint) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatUint(uint64(v.Val()), 10)), nil
+}
diff --git a/container/gtype/uint32.go b/container/gtype/uint32.go
index ee68dcf44..3cc109d32 100644
--- a/container/gtype/uint32.go
+++ b/container/gtype/uint32.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Uint32) Add(delta uint32) (new uint32) {
 func (v *Uint32) Cas(old, new uint32) bool {
 	return atomic.CompareAndSwapUint32(&v.value, old, new)
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Uint32) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatUint(uint64(v.Val()), 10)), nil
+}
diff --git a/container/gtype/uint64.go b/container/gtype/uint64.go
index bfb0c94bc..fca77c1c6 100644
--- a/container/gtype/uint64.go
+++ b/container/gtype/uint64.go
@@ -7,6 +7,8 @@
 package gtype
 
 import (
+	"github.com/gogf/gf/util/gconv"
+	"strconv"
 	"sync/atomic"
 )
 
@@ -49,3 +51,8 @@ func (v *Uint64) Add(delta uint64) (new uint64) {
 func (v *Uint64) Cas(old, new uint64) bool {
 	return atomic.CompareAndSwapUint64(&v.value, old, new)
 }
+
+// MarshalJSON implements the interface MarshalJSON for json.Marshal.
+func (v *Uint64) MarshalJSON() ([]byte, error) {
+	return gconv.UnsafeStrToBytes(strconv.FormatUint(v.Val(), 10)), nil
+}
diff --git a/container/gtype/z_bench_test.go b/container/gtype/z_bench_basic_test.go
similarity index 92%
rename from container/gtype/z_bench_test.go
rename to container/gtype/z_bench_basic_test.go
index d9570f631..22ac9abfc 100644
--- a/container/gtype/z_bench_test.go
+++ b/container/gtype/z_bench_basic_test.go
@@ -16,18 +16,19 @@ import (
 	"github.com/gogf/gf/encoding/gbinary"
 )
 
-var it = NewInt()
-var it32 = NewInt32()
-var it64 = NewInt64()
-var uit = NewUint()
-var uit32 = NewUint32()
-var uit64 = NewUint64()
-var bl = NewBool()
-var bytes = NewBytes()
-var str = NewString()
-var inf = NewInterface()
-
-var at = atomic.Value{}
+var (
+	it    = NewInt()
+	it32  = NewInt32()
+	it64  = NewInt64()
+	uit   = NewUint()
+	uit32 = NewUint32()
+	uit64 = NewUint64()
+	bl    = NewBool()
+	bytes = NewBytes()
+	str   = NewString()
+	inf   = NewInterface()
+	at    = atomic.Value{}
+)
 
 func BenchmarkInt_Set(b *testing.B) {
 	for i := 0; i < b.N; i++ {
diff --git a/container/gtype/z_bench_json_test.go b/container/gtype/z_bench_json_test.go
new file mode 100644
index 000000000..db43ae7db
--- /dev/null
+++ b/container/gtype/z_bench_json_test.go
@@ -0,0 +1,103 @@
+// Copyright 2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+// go test *.go -bench=".+\_Json" -benchmem
+
+package gtype_test
+
+import (
+	"encoding/json"
+	"github.com/gogf/gf/container/gtype"
+	"testing"
+)
+
+var (
+	vBool      = gtype.NewBool()
+	vByte      = gtype.NewByte()
+	vBytes     = gtype.NewBytes()
+	vFloat32   = gtype.NewFloat32()
+	vFloat64   = gtype.NewFloat64()
+	vInt       = gtype.NewInt()
+	vInt32     = gtype.NewInt32()
+	vInt64     = gtype.NewInt64()
+	vInterface = gtype.NewInterface()
+	vString    = gtype.NewString()
+	vUint      = gtype.NewUint()
+	vUint32    = gtype.NewUint32()
+	vUint64    = gtype.NewUint64()
+)
+
+func Benchmark_Bool_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vBool)
+	}
+}
+
+func Benchmark_Byte_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vByte)
+	}
+}
+
+func Benchmark_Bytes_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vBytes)
+	}
+}
+
+func Benchmark_Float32_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vFloat32)
+	}
+}
+
+func Benchmark_Float64_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vFloat64)
+	}
+}
+
+func Benchmark_Int_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vInt)
+	}
+}
+
+func Benchmark_Int32_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vInt32)
+	}
+}
+
+func Benchmark_Int64_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vInt64)
+	}
+}
+
+func Benchmark_Interface_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vInterface)
+	}
+}
+
+func Benchmark_String_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vString)
+	}
+}
+
+func Benchmark_Uint_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vUint)
+	}
+}
+
+func Benchmark_Uint32_Json(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		json.Marshal(vUint64)
+	}
+}
diff --git a/container/gtype/z_unit_test.go b/container/gtype/z_unit_test.go
index bd9675057..fc242d6db 100644
--- a/container/gtype/z_unit_test.go
+++ b/container/gtype/z_unit_test.go
@@ -7,6 +7,7 @@
 package gtype_test
 
 import (
+	"encoding/json"
 	"sync"
 	"testing"
 
@@ -35,6 +36,24 @@ func Test_Bool(t *testing.T) {
 		i2 := gtype.NewBool()
 		gtest.AssertEQ(i2.Val(), false)
 	})
+
+	gtest.Case(t, func() {
+		i := gtype.NewBool(true)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
+
+	gtest.Case(t, func() {
+		i := gtype.NewBool(false)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Byte(t *testing.T) {
@@ -59,6 +78,14 @@ func Test_Byte(t *testing.T) {
 		i1 := gtype.NewByte()
 		gtest.AssertEQ(i1.Val(), byte(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewByte(254)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Bytes(t *testing.T) {
@@ -72,6 +99,14 @@ func Test_Bytes(t *testing.T) {
 		i1 := gtype.NewBytes()
 		gtest.AssertEQ(i1.Val(), nil)
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewBytes([]byte("i love gf"))
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_String(t *testing.T) {
@@ -85,6 +120,14 @@ func Test_String(t *testing.T) {
 		i1 := gtype.NewString()
 		gtest.AssertEQ(i1.Val(), "")
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewString("i love gf")
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Interface(t *testing.T) {
@@ -100,6 +143,14 @@ func Test_Interface(t *testing.T) {
 		i1 := gtype.New()
 		gtest.AssertEQ(i1.Val(), nil)
 	})
+	gtest.Case(t, func() {
+		i := gtype.New("i love gf")
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Float32(t *testing.T) {
@@ -125,6 +176,14 @@ func Test_Float32(t *testing.T) {
 		i1 := gtype.NewFloat32()
 		gtest.AssertEQ(i1.Val(), float32(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewFloat32(3.333)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Float64(t *testing.T) {
@@ -150,6 +209,14 @@ func Test_Float64(t *testing.T) {
 		i1 := gtype.NewFloat64()
 		gtest.AssertEQ(i1.Val(), float64(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewFloat64(3.333)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Int(t *testing.T) {
@@ -174,6 +241,14 @@ func Test_Int(t *testing.T) {
 		i1 := gtype.NewInt()
 		gtest.AssertEQ(i1.Val(), 0)
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewInt(666)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Int32(t *testing.T) {
@@ -198,6 +273,14 @@ func Test_Int32(t *testing.T) {
 		i1 := gtype.NewInt32()
 		gtest.AssertEQ(i1.Val(), int32(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewInt32(666)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Int64(t *testing.T) {
@@ -222,6 +305,14 @@ func Test_Int64(t *testing.T) {
 		i1 := gtype.NewInt64()
 		gtest.AssertEQ(i1.Val(), int64(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewInt64(666)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Uint(t *testing.T) {
@@ -246,6 +337,14 @@ func Test_Uint(t *testing.T) {
 		i1 := gtype.NewUint()
 		gtest.AssertEQ(i1.Val(), uint(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewUint(666)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Uint32(t *testing.T) {
@@ -270,6 +369,14 @@ func Test_Uint32(t *testing.T) {
 		i1 := gtype.NewUint32()
 		gtest.AssertEQ(i1.Val(), uint32(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewUint32(666)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
 
 func Test_Uint64(t *testing.T) {
@@ -294,4 +401,12 @@ func Test_Uint64(t *testing.T) {
 		i1 := gtype.NewUint64()
 		gtest.AssertEQ(i1.Val(), uint64(0))
 	})
+	gtest.Case(t, func() {
+		i := gtype.NewUint64(666)
+		b1, err1 := json.Marshal(i)
+		b2, err2 := json.Marshal(i.Val())
+		gtest.Assert(err1, nil)
+		gtest.Assert(err2, nil)
+		gtest.Assert(b1, b2)
+	})
 }
diff --git a/encoding/gbase64/gbase64.go b/encoding/gbase64/gbase64.go
index 77db9cdb4..409780b66 100644
--- a/encoding/gbase64/gbase64.go
+++ b/encoding/gbase64/gbase64.go
@@ -9,6 +9,7 @@ package gbase64
 
 import (
 	"encoding/base64"
+	"github.com/gogf/gf/util/gconv"
 )
 
 // Encode encodes bytes with BASE64 algorithm.
@@ -32,7 +33,7 @@ func EncodeString(src string) string {
 
 // EncodeToString encodes bytes to string with BASE64 algorithm.
 func EncodeToString(src []byte) string {
-	return string(Encode(src))
+	return gconv.UnsafeBytesToStr(Encode(src))
 }
 
 // DecodeString decodes string with BASE64 algorithm.
@@ -43,5 +44,5 @@ func DecodeString(str string) ([]byte, error) {
 // DecodeString decodes string with BASE64 algorithm.
 func DecodeToString(str string) (string, error) {
 	b, err := DecodeString(str)
-	return string(b), err
+	return gconv.UnsafeBytesToStr(b), err
 }
diff --git a/encoding/gbinary/gbinary_le.go b/encoding/gbinary/gbinary_le.go
index 2b236bfa9..07632b3ae 100644
--- a/encoding/gbinary/gbinary_le.go
+++ b/encoding/gbinary/gbinary_le.go
@@ -135,7 +135,7 @@ func LeEncodeInt8(i int8) []byte {
 }
 
 func LeEncodeUint8(i uint8) []byte {
-	return []byte{byte(i)}
+	return []byte{i}
 }
 
 func LeEncodeInt16(i int16) []byte {
diff --git a/util/gconv/gconv.go b/util/gconv/gconv.go
index 4b8f4afac..84ebe7968 100644
--- a/util/gconv/gconv.go
+++ b/util/gconv/gconv.go
@@ -114,7 +114,7 @@ func Byte(i interface{}) byte {
 	if v, ok := i.(byte); ok {
 		return v
 	}
-	return byte(Uint8(i))
+	return Uint8(i)
 }
 
 // Bytes converts <i> to []byte.
@@ -155,7 +155,7 @@ func String(i interface{}) string {
 	}
 	switch value := i.(type) {
 	case int:
-		return strconv.FormatInt(int64(value), 10)
+		return strconv.Itoa(value)
 	case int8:
 		return strconv.Itoa(int(value))
 	case int16:
@@ -163,7 +163,7 @@ func String(i interface{}) string {
 	case int32:
 		return strconv.Itoa(int(value))
 	case int64:
-		return strconv.FormatInt(int64(value), 10)
+		return strconv.FormatInt(value, 10)
 	case uint:
 		return strconv.FormatUint(uint64(value), 10)
 	case uint8:
@@ -173,7 +173,7 @@ func String(i interface{}) string {
 	case uint32:
 		return strconv.FormatUint(uint64(value), 10)
 	case uint64:
-		return strconv.FormatUint(uint64(value), 10)
+		return strconv.FormatUint(value, 10)
 	case float32:
 		return strconv.FormatFloat(float64(value), 'f', -1, 32)
 	case float64:
diff --git a/util/gconv/gconv_unsafe.go b/util/gconv/gconv_unsafe.go
index 08f8b3c6e..f5d327481 100644
--- a/util/gconv/gconv_unsafe.go
+++ b/util/gconv/gconv_unsafe.go
@@ -9,11 +9,15 @@ package gconv
 import "unsafe"
 
 // UnsafeStrToBytes converts string to []byte without memory copy.
+// Note that, if you completely sure you will never use <s> in the feature,
+// you can use this unsafe function to implement type conversion in high performance.
 func UnsafeStrToBytes(s string) []byte {
 	return *(*[]byte)(unsafe.Pointer(&s))
 }
 
 // UnsafeBytesToStr converts []byte to string without memory copy.
+// Note that, if you completely sure you will never use <s> in the feature,
+// you can use this unsafe function to implement type conversion in high performance.
 func UnsafeBytesToStr(b []byte) string {
 	return *(*string)(unsafe.Pointer(&b))
 }