diff --git a/contrib/log/aliyun/aliyun.go b/contrib/log/aliyun/aliyun.go
index 390cb571e..a5e57ca6b 100644
--- a/contrib/log/aliyun/aliyun.go
+++ b/contrib/log/aliyun/aliyun.go
@@ -127,7 +127,7 @@ func NewAliyunLog(options ...Option) Logger {
 	}
 }
 
-// toString 任意类型转string
+// toString convert any type to string
 func toString(v interface{}) string {
 	var key string
 	if v == nil {
diff --git a/contrib/log/aliyun/aliyun_test.go b/contrib/log/aliyun/aliyun_test.go
index d7acf6bbd..a5e1f0806 100644
--- a/contrib/log/aliyun/aliyun_test.go
+++ b/contrib/log/aliyun/aliyun_test.go
@@ -1,6 +1,7 @@
 package aliyun
 
 import (
+	"math"
 	"testing"
 
 	"github.com/go-kratos/kratos/v2/log"
@@ -97,3 +98,34 @@ func TestLog(t *testing.T) {
 		t.Errorf("Log() returns error:%v", err)
 	}
 }
+
+func TestToString(t *testing.T) {
+	tests := []struct {
+		in  interface{}
+		out string
+	}{
+		{math.MaxFloat64, "17976931348623157000000000000000000000000000000000000" +
+			"000000000000000000000000000000000000000000000000000000000000000000000000000" +
+			"000000000000000000000000000000000000000000000000000000000000000000000000000" +
+			"000000000000000000000000000000000000000000000000000000000000000000000000000" +
+			"0000000000000000000000000000000"},
+		{math.MaxFloat32, "340282346638528860000000000000000000000"},
+		{1<<((32<<(^uint(0)>>63))-1) - 1, "9223372036854775807"},
+		{uint(1<<(32<<(^uint(0)>>63)) - 1), "-1"},
+		{math.MaxInt8, "127"},
+		{math.MaxUint8, "255"},
+		{math.MaxInt16, "32767"},
+		{math.MaxUint16, "65535"},
+		{math.MaxInt32, "2147483647"},
+		{math.MaxUint32, "4294967295"},
+		{math.MaxInt64, "9223372036854775807"},
+		{uint64(math.MaxUint64), "18446744073709551615"},
+		{"abc", "abc"},
+		{[]byte("abc"), "abc"},
+	}
+	for _, test := range tests {
+		if toString(test.in) != test.out {
+			t.Fatalf("want: %s, got: %s", test.out, toString(test.in))
+		}
+	}
+}