diff --git a/ledis/t_zset.go b/ledis/t_zset.go
index 3a2336f..dc028c0 100644
--- a/ledis/t_zset.go
+++ b/ledis/t_zset.go
@@ -939,3 +939,83 @@ func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 func (db *DB) ZScan(key []byte, count int, inclusive bool, match string) ([][]byte, error) {
 	return db.scan(ZSizeType, key, count, inclusive, match)
 }
+
+func (db *DB) ZRangeByLex(key []byte, min []byte, max []byte, rangeType uint8, offset int, count int) ([][]byte, error) {
+	if min == nil {
+		min = db.zEncodeStartSetKey(key)
+	} else {
+		min = db.zEncodeSetKey(key, min)
+	}
+	if max == nil {
+		max = db.zEncodeStopSetKey(key)
+	} else {
+		max = db.zEncodeSetKey(key, max)
+	}
+
+	it := db.bucket.RangeLimitIterator(min, max, rangeType, offset, count)
+	defer it.Close()
+
+	ay := make([][]byte, 0, 16)
+	for ; it.Valid(); it.Next() {
+		if _, m, err := db.zDecodeSetKey(it.Key()); err == nil {
+			ay = append(ay, m)
+		}
+	}
+
+	return ay, nil
+}
+
+func (db *DB) ZRemRangeByLex(key []byte, min []byte, max []byte, rangeType uint8) (int64, error) {
+	if min == nil {
+		min = db.zEncodeStartSetKey(key)
+	} else {
+		min = db.zEncodeSetKey(key, min)
+	}
+	if max == nil {
+		max = db.zEncodeStopSetKey(key)
+	} else {
+		max = db.zEncodeSetKey(key, max)
+	}
+
+	t := db.zsetBatch
+	t.Lock()
+	defer t.Unlock()
+
+	it := db.bucket.RangeIterator(min, max, rangeType)
+	defer it.Close()
+
+	var n int64 = 0
+	for ; it.Valid(); it.Next() {
+		t.Delete(it.RawKey())
+		n++
+	}
+
+	if err := t.Commit(); err != nil {
+		return 0, err
+	}
+
+	return n, nil
+}
+
+func (db *DB) ZLexCount(key []byte, min []byte, max []byte, rangeType uint8) (int64, error) {
+	if min == nil {
+		min = db.zEncodeStartSetKey(key)
+	} else {
+		min = db.zEncodeSetKey(key, min)
+	}
+	if max == nil {
+		max = db.zEncodeStopSetKey(key)
+	} else {
+		max = db.zEncodeSetKey(key, max)
+	}
+
+	it := db.bucket.RangeIterator(min, max, rangeType)
+	defer it.Close()
+
+	var n int64 = 0
+	for ; it.Valid(); it.Next() {
+		n++
+	}
+
+	return n, nil
+}
diff --git a/ledis/t_zset_test.go b/ledis/t_zset_test.go
index a1754ed..98f0a81 100644
--- a/ledis/t_zset_test.go
+++ b/ledis/t_zset_test.go
@@ -2,6 +2,8 @@ package ledis
 
 import (
 	"fmt"
+	"github.com/siddontang/ledisdb/store"
+	"reflect"
 	"testing"
 )
 
@@ -407,3 +409,59 @@ func TestZScan(t *testing.T) {
 		t.Fatal("invalid value length ", len(v))
 	}
 }
+
+func TestZLex(t *testing.T) {
+	db := getTestDB()
+	if _, err := db.zFlush(); err != nil {
+		t.Fatal(err)
+	}
+
+	key := []byte("myzset")
+	if _, err := db.ZAdd(key, ScorePair{0, []byte("a")},
+		ScorePair{0, []byte("b")},
+		ScorePair{0, []byte("c")},
+		ScorePair{0, []byte("d")},
+		ScorePair{0, []byte("e")},
+		ScorePair{0, []byte("f")},
+		ScorePair{0, []byte("g")}); err != nil {
+		t.Fatal(err)
+	}
+
+	if ay, err := db.ZRangeByLex(key, nil, []byte("c"), store.RangeClose, 0, -1); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, [][]byte{[]byte("a"), []byte("b"), []byte("c")}) {
+		t.Fatal("must equal a, b, c")
+	}
+
+	if ay, err := db.ZRangeByLex(key, nil, []byte("c"), store.RangeROpen, 0, -1); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, [][]byte{[]byte("a"), []byte("b")}) {
+		t.Fatal("must equal a, b")
+	}
+
+	if ay, err := db.ZRangeByLex(key, []byte("aaa"), []byte("g"), store.RangeROpen, 0, -1); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, [][]byte{[]byte("b"),
+		[]byte("c"), []byte("d"), []byte("e"), []byte("f")}) {
+		t.Fatal("must equal b, c, d, e, f", fmt.Sprintf("%q", ay))
+	}
+
+	if n, err := db.ZLexCount(key, nil, nil, store.RangeClose); err != nil {
+		t.Fatal(err)
+	} else if n != 7 {
+		t.Fatal(n)
+	}
+
+	if n, err := db.ZRemRangeByLex(key, []byte("aaa"), []byte("g"), store.RangeROpen); err != nil {
+		t.Fatal(err)
+	} else if n != 5 {
+		t.Fatal(n)
+	}
+
+	if n, err := db.ZLexCount(key, nil, nil, store.RangeClose); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+}
diff --git a/server/cmd_zset.go b/server/cmd_zset.go
index 4763683..3c5abcb 100644
--- a/server/cmd_zset.go
+++ b/server/cmd_zset.go
@@ -5,6 +5,7 @@ import (
 	"github.com/siddontang/go/hack"
 	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/ledis"
+	"github.com/siddontang/ledisdb/store"
 	"math"
 	"strconv"
 	"strings"
@@ -661,6 +662,128 @@ func zxscanCommand(c *client) error {
 	return nil
 }
 
+func zparseMemberRange(minBuf []byte, maxBuf []byte) (min []byte, max []byte, rangeType uint8, err error) {
+	rangeType = store.RangeClose
+	if strings.ToLower(hack.String(minBuf)) == "-" {
+		min = nil
+	} else {
+		if len(minBuf) == 0 {
+			err = ErrCmdParams
+			return
+		}
+
+		if minBuf[0] == '(' {
+			rangeType |= store.RangeLOpen
+			min = minBuf[1:]
+		} else if minBuf[0] == '[' {
+			min = minBuf[1:]
+		} else {
+			err = ErrCmdParams
+			return
+		}
+	}
+
+	if strings.ToLower(hack.String(maxBuf)) == "+" {
+		max = nil
+	} else {
+		if len(maxBuf) == 0 {
+			err = ErrCmdParams
+			return
+		}
+		if maxBuf[0] == '(' {
+			rangeType |= store.RangeROpen
+			max = maxBuf[1:]
+		} else if maxBuf[0] == '[' {
+			max = maxBuf[1:]
+		} else {
+			err = ErrCmdParams
+			return
+		}
+	}
+
+	return
+}
+
+func zrangebylexCommand(c *client) error {
+	args := c.args
+	if len(args) != 3 && len(args) != 6 {
+		return ErrCmdParams
+	}
+
+	min, max, rangeType, err := zparseMemberRange(args[1], args[2])
+	if err != nil {
+		return err
+	}
+
+	var offset int = 0
+	var count int = -1
+
+	if len(args) == 6 {
+		if strings.ToLower(hack.String(args[3])) != "limit" {
+			return ErrSyntax
+		}
+
+		if offset, err = strconv.Atoi(hack.String(args[4])); err != nil {
+			return ErrValue
+		}
+
+		if count, err = strconv.Atoi(hack.String(args[5])); err != nil {
+			return ErrValue
+		}
+	}
+
+	key := args[0]
+	if ay, err := c.db.ZRangeByLex(key, min, max, rangeType, offset, count); err != nil {
+		return err
+	} else {
+		c.resp.writeSliceArray(ay)
+	}
+
+	return nil
+}
+
+func zremrangebylexCommand(c *client) error {
+	args := c.args
+	if len(args) != 3 {
+		return ErrCmdParams
+	}
+
+	min, max, rangeType, err := zparseMemberRange(args[1], args[2])
+	if err != nil {
+		return err
+	}
+
+	key := args[0]
+	if n, err := c.db.ZRemRangeByLex(key, min, max, rangeType); err != nil {
+		return err
+	} else {
+		c.resp.writeInteger(n)
+	}
+
+	return nil
+}
+
+func zlexcountCommand(c *client) error {
+	args := c.args
+	if len(args) != 3 {
+		return ErrCmdParams
+	}
+
+	min, max, rangeType, err := zparseMemberRange(args[1], args[2])
+	if err != nil {
+		return err
+	}
+
+	key := args[0]
+	if n, err := c.db.ZLexCount(key, min, max, rangeType); err != nil {
+		return err
+	} else {
+		c.resp.writeInteger(n)
+	}
+
+	return nil
+}
+
 func init() {
 	register("zadd", zaddCommand)
 	register("zcard", zcardCommand)
@@ -680,6 +803,10 @@ func init() {
 	register("zunionstore", zunionstoreCommand)
 	register("zinterstore", zinterstoreCommand)
 
+	register("zrangebylex", zrangebylexCommand)
+	register("zremrangebylex", zremrangebylexCommand)
+	register("zlexcount", zlexcountCommand)
+
 	//ledisdb special command
 
 	register("zclear", zclearCommand)
diff --git a/server/cmd_zset_test.go b/server/cmd_zset_test.go
index 8c74bdc..59411c5 100644
--- a/server/cmd_zset_test.go
+++ b/server/cmd_zset_test.go
@@ -3,6 +3,7 @@ package server
 import (
 	"fmt"
 	"github.com/siddontang/ledisdb/client/go/ledis"
+	"reflect"
 	"strconv"
 	"testing"
 )
@@ -737,3 +738,51 @@ func TestZInterStore(t *testing.T) {
 		}
 	}
 }
+
+func TestZSetLex(t *testing.T) {
+	c := getTestConn()
+	defer c.Close()
+
+	key := []byte("myzlexset")
+	if _, err := c.Do("zadd", key,
+		0, "a", 0, "b", 0, "c", 0, "d", 0, "e", 0, "f", 0, "g"); err != nil {
+		t.Fatal(err)
+	}
+
+	if ay, err := ledis.Strings(c.Do("zrangebylex", key, "-", "[c")); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, []string{"a", "b", "c"}) {
+		t.Fatal("must equal")
+	}
+
+	if ay, err := ledis.Strings(c.Do("zrangebylex", key, "-", "(c")); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, []string{"a", "b"}) {
+		t.Fatal("must equal")
+	}
+
+	if ay, err := ledis.Strings(c.Do("zrangebylex", key, "[aaa", "(g")); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, []string{"b", "c", "d", "e", "f"}) {
+		t.Fatal("must equal")
+	}
+
+	if n, err := ledis.Int64(c.Do("zlexcount", key, "-", "(c")); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+	if n, err := ledis.Int64(c.Do("zremrangebylex", key, "[aaa", "(g")); err != nil {
+		t.Fatal(err)
+	} else if n != 5 {
+		t.Fatal(n)
+	}
+
+	if n, err := ledis.Int64(c.Do("zlexcount", key, "-", "+")); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+}