diff --git a/binding/golang/README.md b/binding/golang/README.md
new file mode 100644
index 0000000..8245dfd
--- /dev/null
+++ b/binding/golang/README.md
@@ -0,0 +1,60 @@
+golang 实现ip地址查询
+
+获取
+
+```
+go get github.com/mohong122/ip2region/binding/golang
+```
+
+
+
+
+使用
+
+```golang
+
+package main
+
+import (
+	"fmt"
+	"github.com/mohong122/ip2region/binding/golang"
+)
+
+func main() {
+	fmt.Println("err")
+	region, err := ip2region.New("ip2region.db")
+	defer region.Close()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	ip, err := region.MemorySearch("127.0.0.1")
+	fmt.Println(ip, err)
+	ip, err = region.BinarySearch("127.0.0.1")
+	fmt.Println(ip, err)
+	ip, err = region.BtreeSearch("127.0.0.1")
+	fmt.Println(ip, err)
+}
+
+```
+
+返回对象
+```golang
+type IpInfo struct {
+	CityId   int64
+	Country  string
+	Region   string
+	Province string
+	City     string
+	ISP      string
+}
+```
+
+性能
+
+|名称|次数|平均耗时|
+|---|---|------|
+BenchmarkBtreeSearch-4|    200000 |             7715 ns/op
+BenchmarkMemorySearch-4|  2000000  |             840 ns/op
+BenchmarkBinarySearch-4|    30000   |          42680 ns/op
+
diff --git a/binding/golang/ip2Region.go b/binding/golang/ip2Region.go
index 7550210..d241c42 100644
--- a/binding/golang/ip2Region.go
+++ b/binding/golang/ip2Region.go
@@ -110,7 +110,7 @@ func (this *Ip2Region) MemorySearch(ipStr string) (ipInfo IpInfo, err error) {
 	var dataPtr, l int64;
 	for (l <= h) {
 
-		m := l + h >> 1
+		m := (l + h) >> 1
 		p := this.firstIndexPtr + m * INDEX_BLOCK_LENGTH
 		sip := getLong(this.dbBinStr, p)
 		if ip < sip {
diff --git a/binding/golang/ip2Region_test.go b/binding/golang/ip2Region_test.go
index 8bf5fc9..5fb717c 100644
--- a/binding/golang/ip2Region_test.go
+++ b/binding/golang/ip2Region_test.go
@@ -4,25 +4,13 @@ import (
 	"testing"
 )
 
-func TestGetLong(t *testing.T) {
-	//region, err := New("../../../data/ip2region.db ")
-	//if err != nil {
-	//	t.Error(err)
-	//}
-	//region.BtreeSearch("222.46.20.201")
-	//region.MemorySearch("222.46.20.201")
-
-	//getLong([]byte("abcd"), 0)
-
-}
-
 func BenchmarkBtreeSearch(B *testing.B) {
 	region, err := New("../../data/ip2region.db ")
 	if err != nil {
 		B.Error(err)
 	}
 	for i:=0;i<B.N;i++{
-		region.BtreeSearch("222.46.20.201")
+		region.BtreeSearch("127.0.0.1")
 	}
 
 }
@@ -33,7 +21,7 @@ func BenchmarkMemorySearch(B *testing.B) {
 		B.Error(err)
 	}
 	for i:=0;i<B.N;i++{
-		region.MemorySearch("251.1.12.1")
+		region.MemorySearch("127.0.0.1")
 	}
 
 }
@@ -44,7 +32,7 @@ func BenchmarkBinarySearch(B *testing.B) {
 		B.Error(err)
 	}
 	for i:=0;i<B.N;i++{
-		region.BinarySearch("222.46.20.201")
+		region.BinarySearch("127.0.0.1")
 	}
 
 }