diff --git a/common/redisclient.go b/common/redisclient.go
index 4f977db..3149259 100644
--- a/common/redisclient.go
+++ b/common/redisclient.go
@@ -144,14 +144,23 @@ func (client *RedisClient) readBulkString(data *[]byte) (size int, err error) {
 	return
 }
 
+var dataPool = sync.Pool{
+	New: func() interface{} {
+		return make([]byte, 8*1024)
+	},
+}
+
 func (client *RedisClient) QueryCuboid(cuboid Cuboid, fn func(*Block)) (count int, err error) {
 	p1 := CoordToPlain(cuboid.P1)
 	p2 := CoordToPlain(cuboid.P2)
 	if err = client.writeHSpatial(p1, p2); err != nil {
 		return
 	}
+
+	data := dataPool.Get().([]byte)
+	defer dataPool.Put(data[:0])
+
 	var (
-		data  = make([]byte, 8*1024)
 		block = Block{}
 		size  int
 		key   int64
@@ -164,14 +173,14 @@ func (client *RedisClient) QueryCuboid(cuboid Cuboid, fn func(*Block)) (count in
 		if size <= 0 {
 			break
 		}
-		if key, err = DecodeStringFromBytes(data[0:size]); err != nil {
+		if key, err = DecodeStringFromBytes(data[:size]); err != nil {
 			return
 		}
 		block.Coord = PlainToCoord(key)
 		if size, err = client.readBulkString(&data); err != nil || size < 0 {
 			return
 		}
-		block.Data = data[0:size]
+		block.Data = data[:size]
 		fn(&block)
 	}