diff --git a/ledis/t_zset_test.go b/ledis/t_zset_test.go
index 92c0a3d..202da70 100644
--- a/ledis/t_zset_test.go
+++ b/ledis/t_zset_test.go
@@ -77,7 +77,7 @@ func TestDBZSet(t *testing.T) {
 		t.Fatal(s)
 	}
 
-	if s, err := db.ZScore(key, bin("zzz")); err != errScoreMiss || s != InvalidScore {
+	if s, err := db.ZScore(key, bin("zzz")); err != ErrScoreMiss || s != InvalidScore {
 		t.Fatal(fmt.Sprintf("s=[%d] err=[%s]", s, err))
 	}
 
diff --git a/server/cmd_zset.go b/server/cmd_zset.go
index d9cb78a..c72fa71 100644
--- a/server/cmd_zset.go
+++ b/server/cmd_zset.go
@@ -110,7 +110,7 @@ func zincrbyCommand(c *client) error {
 	if v, err := c.db.ZIncrBy(key, delta, args[2]); err != nil {
 		return err
 	} else {
-		c.writeBulk(v)
+		c.writeBulk(ledis.StrPutInt64(v))
 	}
 
 	return nil
@@ -312,10 +312,16 @@ func zrangeGeneric(c *client, reverse bool) error {
 		withScores = true
 	}
 
-	if v, err := c.db.ZRangeGeneric(key, start, stop, withScores, reverse); err != nil {
+	if datas, err := c.db.ZRangeGeneric(key, start, stop, withScores, reverse); err != nil {
 		return err
 	} else {
-		c.writeArray(v)
+		if withScores {
+			for i := len(datas) - 1; i > 0; i -= 2 {
+				v, _ := datas[i].(int64)
+				datas[i] = ledis.StrPutInt64(v)
+			}
+		}
+		c.writeArray(datas)
 	}
 	return nil
 }
@@ -377,10 +383,16 @@ func zrangebyscoreGeneric(c *client, reverse bool) error {
 		return nil
 	}
 
-	if v, err := c.db.ZRangeByScoreGeneric(key, min, max, withScores, offset, count, reverse); err != nil {
+	if datas, err := c.db.ZRangeByScoreGeneric(key, min, max, withScores, offset, count, reverse); err != nil {
 		return err
 	} else {
-		c.writeArray(v)
+		if withScores {
+			for i := len(datas) - 1; i > 0; i -= 2 {
+				v, _ := datas[i].(int64)
+				datas[i] = ledis.StrPutInt64(v)
+			}
+		}
+		c.writeArray(datas)
 	}
 
 	return nil