diff --git a/binding/golang/main.go b/binding/golang/main.go
index 4e39333..da5ff1a 100644
--- a/binding/golang/main.go
+++ b/binding/golang/main.go
@@ -339,13 +339,7 @@ func testBench() {
 			return
 		}
 
-		mip, err := xdb.IPMiddle(sip, eip)
-		if err != nil {
-			fmt.Printf("IPMiddle(%s,%s): %s", xdb.IP2String(sip), xdb.IP2String(eip), err)
-			return
-		}
-
-		for _, ip := range [][]byte{sip, mip, eip} {
+		for _, ip := range [][]byte{sip, eip} {
 			sTime := time.Now()
 			region, err := searcher.Search(ip)
 			if err != nil {
diff --git a/binding/golang/service/ip2region_test.go b/binding/golang/service/ip2region_test.go
index 4d84351..b553c90 100644
--- a/binding/golang/service/ip2region_test.go
+++ b/binding/golang/service/ip2region_test.go
@@ -245,12 +245,12 @@ func TestConcurrentCall(t *testing.T) {
 				}
 
 				if l := len(ipBytes); l == 4 {
-					if region != "中国|广东省|深圳市|电信" {
+					if region != "中国|广东省|深圳市|电信|CN" {
 						fmt.Print("Error: region not equals")
 						break
 					}
 				} else {
-					if region != "中国|广东省|深圳市|家庭宽带" {
+					if region != "中国|广东省|深圳市|电信|CN" {
 						fmt.Print("Error: region not equals")
 						break
 					}