diff --git a/ledis/scan.go b/ledis/scan.go
index a1f5fe2..2b530aa 100644
--- a/ledis/scan.go
+++ b/ledis/scan.go
@@ -12,10 +12,10 @@ func (db *DB) scan(dataType byte, key []byte, count int, inclusive bool) ([][]by
 	var minKey, maxKey []byte
 	var err error
 	if key != nil {
-		if err = db.checkKeySize(key); err != nil {
+		if err = checkKeySize(key); err != nil {
 			return nil, err
 		}
-		if minKey, err = db.encodeOffsetKey(dataType, key); err != nil {
+		if minKey, err = db.encodeMetaKey(dataType, key); err != nil {
 			return nil, err
 		}
 
@@ -41,7 +41,15 @@ func (db *DB) scan(dataType byte, key []byte, count int, inclusive bool) ([][]by
 	}
 
 	it := db.db.RangeLimitIterator(minKey, maxKey, rangeType, 0, count)
+	if dataType == BitMetaType {
+		println(minKey[1])
+		println(maxKey[1])
+		it = db.db.RangeIterator(minKey, maxKey, rangeType)
+	}
+
+	//println(TypeName[dataType])
 	for ; it.Valid(); it.Next() {
+		println(TypeName[dataType])
 		if k, err := db.decodeMetaKey(dataType, it.Key()); err != nil {
 			continue
 		} else {
@@ -53,11 +61,14 @@ func (db *DB) scan(dataType byte, key []byte, count int, inclusive bool) ([][]by
 }
 
 func (db *DB) encodeMinKey(dataType byte) ([]byte, error) {
-	return db.encodeOffsetKey(dataType, nil)
+	return db.encodeMetaKey(dataType, nil)
 }
 
 func (db *DB) encodeMaxKey(dataType byte) ([]byte, error) {
-	k := db.encodeOffsetKey(dataType, nil)
+	k, err := db.encodeMetaKey(dataType, nil)
+	if err != nil {
+		return nil, err
+	}
 	k[len(k)-1] = dataType + 1
 	return k, nil
 }
@@ -75,10 +86,10 @@ func (db *DB) encodeMetaKey(dataType byte, key []byte) ([]byte, error) {
 	case BitMetaType:
 		return db.bEncodeMetaKey(key), nil
 	default:
-		return nil, errInvalidDataType
+		return nil, errDataType
 	}
 }
-func (db *DB) decodeMetaKey(dataType, byte, ek []byte) ([]byte, error) {
+func (db *DB) decodeMetaKey(dataType byte, ek []byte) ([]byte, error) {
 	if len(ek) < 2 || ek[0] != db.index || ek[1] != dataType {
 		return nil, errMetaKey
 	}
diff --git a/ledis/scan_test.go b/ledis/scan_test.go
index 86ac846..1eaed0f 100644
--- a/ledis/scan_test.go
+++ b/ledis/scan_test.go
@@ -81,3 +81,158 @@ func TestDBHScan(t *testing.T) {
 	}
 
 }
+
+func TestDBZScan(t *testing.T) {
+	db := getTestDB()
+
+	db.zFlush()
+
+	k1 := []byte("k1")
+	db.ZAdd(k1, ScorePair{1, []byte("m")})
+
+	k2 := []byte("k2")
+	db.ZAdd(k2, ScorePair{2, []byte("m")})
+
+	k3 := []byte("k3")
+	db.ZAdd(k3, ScorePair{3, []byte("m")})
+
+	if v, err := db.ZScan(nil, 1, true); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 1 {
+		t.Fatal("invalid length ", len(v))
+	} else if string(v[0]) != "k1" {
+		t.Fatal("invalid value ", string(v[0]))
+	}
+
+	if v, err := db.ZScan(k1, 2, true); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 2 {
+		t.Fatal("invalid length ", len(v))
+	} else if string(v[0]) != "k1" {
+		t.Fatal("invalid value ", string(v[0]))
+	} else if string(v[1]) != "k2" {
+		t.Fatal("invalid value ", string(v[1]))
+	}
+
+	if v, err := db.ZScan(k1, 2, false); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 2 {
+		t.Fatal("invalid length ", len(v))
+	} else if string(v[0]) != "k2" {
+		t.Fatal("invalid value ", string(v[0]))
+	} else if string(v[1]) != "k3" {
+		t.Fatal("invalid value ", string(v[1]))
+	}
+
+}
+
+func TestDBLScan(t *testing.T) {
+	db := getTestDB()
+
+	db.lFlush()
+
+	k1 := []byte("k1")
+	if _, err := db.LPush(k1, []byte("elem")); err != nil {
+		t.Fatal(err.Error())
+	}
+
+	k2 := []byte("k2")
+	if _, err := db.LPush(k2, []byte("elem")); err != nil {
+		t.Fatal(err.Error())
+	}
+
+	k3 := []byte("k3")
+	if _, err := db.LPush(k3, []byte("elem")); err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if v, err := db.LScan(nil, 1, true); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 1 {
+		t.Fatal("invalid length ", len(v))
+	} else if string(v[0]) != "k1" {
+		t.Fatal("invalid value ", string(v[0]))
+	}
+
+	if v, err := db.LScan(k1, 2, true); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 2 {
+		t.Fatal("invalid length ", len(v))
+	} else if string(v[0]) != "k1" {
+		t.Fatal("invalid value ", string(v[0]))
+	} else if string(v[1]) != "k2" {
+		t.Fatal("invalid value ", string(v[1]))
+	}
+
+	if v, err := db.LScan(k1, 2, false); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 2 {
+		t.Fatal("invalid length ", len(v))
+	} else if string(v[0]) != "k2" {
+		t.Fatal("invalid value ", string(v[0]))
+	} else if string(v[1]) != "k3" {
+		t.Fatal("invalid value ", string(v[1]))
+	}
+
+}
+
+//func TestDBBScan(t *testing.T) {
+//	db := getTestDB()
+//
+//	db.bFlush()
+//
+//	k1 := []byte("k1")
+//	if _, err := db.BSetBit(k1, 1, 1); err != nil {
+//		t.Fatal(err.Error())
+//	}
+//
+//	k2 := []byte("k2")
+//	if _, err := db.BSetBit(k2, 1, 1); err != nil {
+//		t.Fatal(err.Error())
+//	}
+//
+//	k3 := []byte("k3")
+//	if _, err := db.BSetBit(k3, 1, 0); err != nil {
+//		t.Fatal(err.Error())
+//	}
+//	//ek := db.bEncodeMetaKey([]byte("k3"))
+//	ek2, err := db.encodeMetaKey(LMetaType, []byte("k3"))
+//	if err != nil {
+//		t.Fatal(err.Error())
+//	}
+//
+//	endkey, err := db.encodeMaxKey(LMetaType)
+//
+//	if err != nil {
+//		t.Fatal(err.Error())
+//	}
+//
+//	if v, err := db.BScan(nil, 1, true); err != nil {
+//		t.Fatal(err)
+//	} else if len(v) != 1 {
+//		t.Fatal("invalid length ", len(v))
+//	} else if string(v[0]) != "k1" {
+//		t.Fatal("invalid value ", string(v[0]))
+//	}
+//
+//	if v, err := db.BScan(k1, 2, true); err != nil {
+//		t.Fatal(err)
+//	} else if len(v) != 2 {
+//		t.Fatal("invalid length ", len(v))
+//	} else if string(v[0]) != "k1" {
+//		t.Fatal("invalid value ", string(v[0]))
+//	} else if string(v[1]) != "k2" {
+//		t.Fatal("invalid value ", string(v[1]))
+//	}
+//
+//	if v, err := db.BScan(k1, 2, false); err != nil {
+//		t.Fatal(err)
+//	} else if len(v) != 2 {
+//		t.Fatal("invalid length ", len(v))
+//	} else if string(v[0]) != "k2" {
+//		t.Fatal("invalid value ", string(v[0]))
+//	} else if string(v[1]) != "k3" {
+//		t.Fatal("invalid value ", string(v[1]))
+//	}
+//
+//}
diff --git a/ledis/t_bit.go b/ledis/t_bit.go
index 37b788d..ad76bc3 100644
--- a/ledis/t_bit.go
+++ b/ledis/t_bit.go
@@ -903,9 +903,9 @@ func (db *DB) BPersist(key []byte) (int64, error) {
 	return n, err
 }
 
-// func (db *DB) BScan(key []byte, count int, inclusive bool) ([]KVPair, error) {
-
-// }
+func (db *DB) BScan(key []byte, count int, inclusive bool) ([][]byte, error) {
+	return db.scan(BitMetaType, key, count, inclusive)
+}
 
 func (db *DB) bFlush() (drop int64, err error) {
 	t := db.binTx
diff --git a/ledis/t_kv.go b/ledis/t_kv.go
index b58a678..e94a930 100644
--- a/ledis/t_kv.go
+++ b/ledis/t_kv.go
@@ -2,7 +2,6 @@ package ledis
 
 import (
 	"errors"
-	"github.com/siddontang/ledisdb/store"
 	"time"
 )
 
diff --git a/ledis/t_zset.go b/ledis/t_zset.go
index fc86248..bed0c6f 100644
--- a/ledis/t_zset.go
+++ b/ledis/t_zset.go
@@ -766,45 +766,6 @@ func (db *DB) zFlush() (drop int64, err error) {
 	return
 }
 
-func (db *DB) ZScan(key []byte, member []byte, count int, inclusive bool) ([]ScorePair, error) {
-	var minKey []byte
-	if member != nil {
-		if err := checkZSetKMSize(key, member); err != nil {
-			return nil, err
-		}
-
-		minKey = db.zEncodeSetKey(key, member)
-	} else {
-		minKey = db.zEncodeStartSetKey(key)
-	}
-
-	maxKey := db.zEncodeStopSetKey(key)
-
-	if count <= 0 {
-		count = defaultScanCount
-	}
-
-	v := make([]ScorePair, 0, 2*count)
-
-	rangeType := store.RangeROpen
-	if !inclusive {
-		rangeType = store.RangeOpen
-	}
-
-	it := db.db.RangeLimitIterator(minKey, maxKey, rangeType, 0, count)
-	for ; it.Valid(); it.Next() {
-		if _, m, err := db.zDecodeSetKey(it.Key()); err != nil {
-			continue
-		} else {
-			score, _ := Int64(it.Value(), nil)
-			v = append(v, ScorePair{Member: m, Score: score})
-		}
-	}
-	it.Close()
-
-	return v, nil
-}
-
 func (db *DB) ZExpire(key []byte, duration int64) (int64, error) {
 	if duration <= 0 {
 		return 0, errExpireValue
diff --git a/ledis/t_zset_test.go b/ledis/t_zset_test.go
index a2232d3..10782d1 100644
--- a/ledis/t_zset_test.go
+++ b/ledis/t_zset_test.go
@@ -215,33 +215,6 @@ func TestZSetOrder(t *testing.T) {
 	return
 }
 
-func TestDBZScan(t *testing.T) {
-	db := getTestDB()
-
-	db.zFlush()
-
-	key := []byte("key")
-	db.ZAdd(key, pair("a", 0), pair("b", 1), pair("c", 2))
-
-	if v, err := db.ZScan(key, nil, 1, true); err != nil {
-		t.Fatal(err)
-	} else if len(v) != 1 {
-		t.Fatal(len(v))
-	}
-
-	if v, err := db.ZScan(key, []byte("a"), 2, false); err != nil {
-		t.Fatal(err)
-	} else if len(v) != 2 {
-		t.Fatal(len(v))
-	}
-
-	if v, err := db.ZScan(key, nil, 10, true); err != nil {
-		t.Fatal(err)
-	} else if len(v) != 3 {
-		t.Fatal(len(v))
-	}
-}
-
 func TestZSetPersist(t *testing.T) {
 	db := getTestDB()