diff --git a/command/init.go b/command/init.go
index 7757eca9..c7bd578c 100644
--- a/command/init.go
+++ b/command/init.go
@@ -126,8 +126,9 @@ func init() {
 		"zrevrangebyscore": Desc{Proc: AutoCommit(ZRevRangeByScore), Txn: ZRevRangeByScore, Cons: Constraint{-4, flags("rF"), 1, 1, 1}},
 		"zrem":             Desc{Proc: AutoCommit(ZRem), Txn: ZRem, Cons: Constraint{-3, flags("wF"), 1, 1, 1}},
 		"zcard":            Desc{Proc: AutoCommit(ZCard), Txn: ZCard, Cons: Constraint{2, flags("rF"), 1, 1, 1}},
-		//"zcount":           Desc{Proc: AutoCommit(ZCount), Txn: ZCount, Cons: Constraint{4, flags("rF"), 1, 1, 1}},
-		"zscore": Desc{Proc: AutoCommit(ZScore), Txn: ZScore, Cons: Constraint{3, flags("rF"), 1, 1, 1}},
+		"zcount":           Desc{Proc: AutoCommit(ZCount), Txn: ZCount, Cons: Constraint{-4, flags("rF"), 1, 1, 1}},
+		"zscore":           Desc{Proc: AutoCommit(ZScore), Txn: ZScore, Cons: Constraint{3, flags("rF"), 1, 1, 1}},
+		"zscan":            Desc{Proc: AutoCommit(ZScan), Txn: ZScan, Cons: Constraint{-3, flags("rF"), 1, 1, 1}},
 
 		// extension commands
 		"escan": Desc{Proc: AutoCommit(Escan), Txn: Escan, Cons: Constraint{-1, flags("rR"), 0, 0, 0}},
diff --git a/command/zsets.go b/command/zsets.go
index 05f633c3..752cd4f5 100644
--- a/command/zsets.go
+++ b/command/zsets.go
@@ -2,20 +2,18 @@ package command
 
 import (
 	"errors"
-	"fmt"
 	"math"
 	"strconv"
 	"strings"
 
 	"github.com/distributedio/titan/db"
+	"github.com/distributedio/titan/encoding/resp"
 )
 
 // ZAdd adds the specified members with scores to the sorted set
 func ZAdd(ctx *Context, txn *db.Transaction) (OnCommit, error) {
 	key := []byte(ctx.Args[0])
 
-	fmt.Println("zadd", ctx.Args)
-
 	kvs := ctx.Args[1:]
 	if len(kvs)%2 != 0 {
 		return nil, errors.New("ERR syntax error")
@@ -111,6 +109,41 @@ func ZRevRangeByScore(ctx *Context, txn *db.Transaction) (OnCommit, error) {
 	return zAnyOrderRangeByScore(ctx, txn, false)
 }
 
+func ZCount(ctx *Context, txn *db.Transaction) (OnCommit, error) {
+	key := []byte(ctx.Args[0])
+	startScore, startInclude, err := getFloatAndInclude(ctx.Args[1])
+	if err != nil {
+		return nil, ErrMinOrMaxNotFloat
+	}
+	endScore, endInclude, err := getFloatAndInclude(ctx.Args[2])
+	if err != nil {
+		return nil, ErrMinOrMaxNotFloat
+	}
+	zset, err := txn.ZSet(key)
+	if err != nil {
+		if err == db.ErrTypeMismatch {
+			return nil, ErrTypeMismatch
+		}
+		return nil, errors.New("ERR " + err.Error())
+	}
+	if !zset.Exist() {
+		return Integer(ctx.Out, 0), nil
+	}
+
+	items, err := zset.ZAnyOrderRangeByScore(startScore, startInclude,
+		endScore, endInclude,
+		false,
+		int64(0), math.MaxInt64,
+		true)
+	if err != nil {
+		return nil, errors.New("ERR " + err.Error())
+	}
+	if len(items) == 0 {
+		return Integer(ctx.Out, 0), nil
+	}
+	return Integer(ctx.Out, int64(len(items))), nil
+}
+
 func zAnyOrderRangeByScore(ctx *Context, txn *db.Transaction, positiveOrder bool) (OnCommit, error) {
 	key := []byte(ctx.Args[0])
 
@@ -240,3 +273,91 @@ func ZScore(ctx *Context, txn *db.Transaction) (OnCommit, error) {
 
 	return BulkString(ctx.Out, string(score)), nil
 }
+
+func ZScan(ctx *Context, txn *db.Transaction) (OnCommit, error) {
+	var (
+		key        []byte
+		cursor     []byte
+		lastCursor = []byte("0")
+		count      = uint64(defaultScanCount)
+		kvs        = [][]byte{}
+		pattern    []byte
+		isAll      bool
+		err        error
+	)
+	key = []byte(ctx.Args[0])
+	if strings.Compare(ctx.Args[1], "0") != 0 {
+		cursor = []byte(ctx.Args[1])
+	}
+
+	// define return result
+	result := func() {
+		if _, err := resp.ReplyArray(ctx.Out, 2); err != nil {
+			return
+		}
+		resp.ReplyBulkString(ctx.Out, string(lastCursor))
+		if _, err := resp.ReplyArray(ctx.Out, len(kvs)); err != nil {
+			return
+		}
+		for i := range kvs {
+			resp.ReplyBulkString(ctx.Out, string(kvs[i]))
+		}
+	}
+	zset, err := txn.ZSet(key)
+	if err != nil {
+		if err == db.ErrTypeMismatch {
+			return nil, ErrTypeMismatch
+		}
+		return nil, errors.New("ERR " + err.Error())
+	}
+
+	if !zset.Exist() {
+		return result, nil
+	}
+
+	if len(ctx.Args)%2 != 0 {
+		return nil, ErrSyntax
+	}
+
+	for i := 2; i < len(ctx.Args); i += 2 {
+		arg := strings.ToLower(ctx.Args[i])
+		next := ctx.Args[i+1]
+		switch arg {
+		case "count":
+			if count, err = strconv.ParseUint(next, 10, 64); err != nil {
+				return nil, ErrInteger
+			}
+			if count > ScanMaxCount {
+				count = ScanMaxCount
+			}
+			if count == 0 {
+				count = uint64(defaultScanCount)
+			}
+		case "match":
+			pattern = []byte(next)
+			isAll = (pattern[0] == '*' && len(pattern) == 1)
+		}
+	}
+
+	if len(pattern) == 0 {
+		isAll = true
+	}
+	f := func(member, score []byte) bool {
+		if count <= 0 {
+			lastCursor = member
+			return false
+		}
+		if isAll || globMatch(pattern, member, false) {
+			kvs = append(kvs, member)
+			kvs = append(kvs, score)
+			count--
+		}
+		return true
+	}
+
+	if err := zset.ZScan(cursor, f); err != nil {
+		return nil, errors.New("ERR " + err.Error())
+	}
+	return result, nil
+
+}
diff --git a/db/zset.go b/db/zset.go
index 2e89aed6..82146d8b 100644
--- a/db/zset.go
+++ b/db/zset.go
@@ -418,9 +418,7 @@ func (zset *ZSet) ZCard() int64 {
 }
 
 func (zset *ZSet) ZScore(member []byte) ([]byte, error) {
-	dkey := DataKey(zset.txn.db, zset.meta.ID)
-	memberKey := zsetMemberKey(dkey, member)
-	bytesScore, err := zset.txn.t.Get(zset.txn.ctx, memberKey)
+	bScore, err := zset.zScoreBytes(member)
 	if err != nil {
 		if IsErrNotFound(err) {
 			return nil, nil
@@ -428,11 +426,60 @@ func (zset *ZSet) ZScore(member []byte) ([]byte, error) {
 		return nil, err
 	}
 
-	fscore := DecodeFloat64(bytesScore)
+	fscore := DecodeFloat64(bScore)
 	sscore := strconv.FormatFloat(fscore, 'f', -1, 64)
 	return []byte(sscore), nil
 }
 
+func (zset *ZSet) zScoreBytes(member []byte) ([]byte, error) {
+	dkey := DataKey(zset.txn.db, zset.meta.ID)
+	memberKey := zsetMemberKey(dkey, member)
+	bScore, err := zset.txn.t.Get(zset.txn.ctx, memberKey)
+	if err != nil {
+		return nil, err
+	}
+	return bScore, nil
+}
+
+func (zset *ZSet) ZScan(cursor []byte, f func(key, val []byte) bool) error {
+	if !zset.Exist() {
+		return nil
+	}
+	dkey := DataKey(zset.txn.db, zset.meta.ID)
+	prefix := ZSetScorePrefix(dkey)
+	endPrefix := kv.Key(prefix).PrefixNext()
+	ikey := prefix
+	if len(cursor) > 0 {
+		bScore, err := zset.zScoreBytes(cursor)
+		if err != nil {
+			if IsErrNotFound(err) {
+				return nil
+			}
+			return err
+		}
+		if len(bScore) > 0 {
+			ikey = append(ikey, bScore...)
+		}
+	}
+	iter, err := zset.txn.t.Iter(ikey, endPrefix)
+	if err != nil {
+		return err
+	}
+	for iter.Valid() && iter.Key().HasPrefix(prefix) {
+		scoreAndMember := iter.Key()[len(prefix):]
+		member := scoreAndMember[byteScoreLen+len(":"):]
+		byteScore := scoreAndMember[0:byteScoreLen]
+		score := []byte(strconv.FormatFloat(DecodeFloat64(byteScore), 'f', -1, 64))
+		if !f(member, score) {
+			break
+		}
+		if err := iter.Next(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func zsetMemberKey(dkey []byte, member []byte) []byte {
 	var memberKey []byte
 	memberKey = append(memberKey, dkey...)
diff --git a/db/zset_test.go b/db/zset_test.go
index c0b028e7..42b9ac8a 100644
--- a/db/zset_test.go
+++ b/db/zset_test.go
@@ -464,3 +464,67 @@ func TestZSetZAnyOrderRangeScore(t *testing.T) {
 		})
 	}
 }
+
+func TestZSet_ZScan(t *testing.T) {
+	var members [][]byte
+	var score []float64
+
+	members = append(members, []byte("abc"))
+	members = append(members, []byte("aec"))
+	members = append(members, []byte("acc"))
+	members = append(members, []byte("bc"))
+	score = append(score, -1.1, -1, 1, 2.1)
+
+	zset, txn, err := getZSet(t, []byte("TestZSet_ZScan"))
+	assert.NoError(t, err)
+	assert.NotNil(t, txn)
+	assert.NotNil(t, zset)
+	count, err := zset.ZAdd(members, score)
+	assert.NoError(t, err)
+	assert.Equal(t, count, int64(len(members)))
+	txn.Commit(context.TODO())
+
+	type args struct {
+		cursor []byte
+		f      func(key, val []byte) bool
+	}
+	var value [][]byte
+	count = 2
+
+	tests := []struct {
+		name string
+		args args
+		want [][]byte
+	}{
+		{
+			name: "TestZSet_ZScan",
+			args: args{
+				f: func(member, score []byte) bool {
+					if count == 0 {
+						return false
+					}
+					value = append(value, member, score)
+					count--
+					return true
+
+				},
+			},
+			want: append([][]byte{}, []byte("abc"), []byte("-1.1"), []byte("aec"), []byte("-1")),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+
+			zset, txn, err := getZSet(t, []byte("TestZSet_ZScan"))
+			assert.NoError(t, err)
+			assert.NotNil(t, txn)
+			assert.NotNil(t, zset)
+
+			err = zset.ZScan(tt.args.cursor, tt.args.f)
+			txn.Commit(context.TODO())
+
+			assert.Equal(t, value, tt.want)
+			assert.NoError(t, err)
+		})
+	}
+}
diff --git a/tools/autotest/auto.go b/tools/autotest/auto.go
index ed28b560..11408a42 100644
--- a/tools/autotest/auto.go
+++ b/tools/autotest/auto.go
@@ -162,6 +162,36 @@ func (ac *AutoClient) ZSetCase(t *testing.T) {
 	ac.ez.ZRangeByScoreEqual(t, "key-zset", "(2", "3.6", true, "", "member6 2.05 member3 3.6")
 	ac.ez.ZRangeByScoreEqual(t, "key-zset", "0", "(2", true, "", "member5 0 member2 1.5")
 
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "+inf", "-inf", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0 member4 -3.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "(+inf", "-inf", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0 member4 -3.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "+inf", "(-inf", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0 member4 -3.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "inf", "-inf", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0 member4 -3.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "inf", "-inf", false, "", "member3 member6 member11 member1 member2 member5 member4")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "inf", "-3.5", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0 member4 -3.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "inf", "(-3.5", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "inf", "0.0", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5 member5 0")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "inf", "(0.0", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "3.6", "(0.0", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "+3.6", "(0.0", true, "", "member3 3.6 member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "(3.6", "(0.0", true, "", "member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "", "member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT -1 1", "")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "limit 0 -1", "member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 0 0", "")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 0 2", "member6 2.05 member11 2")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 0 4", "member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 0 5", "member6 2.05 member11 2 member1 2 member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 1 2", "member11 2 member1 2")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 3 2", "member2 1.5")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "2.05", "(0.0", true, "LIMIT 4 2", "")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "3.6", "(2", true, "", "member3 3.6 member6 2.05")
+	ac.ez.ZRevRangeByScoreEqual(t, "key-zset", "(2", "0", true, "", "member2 1.5 member5 0")
+
+	ac.ez.ZCountEqual(t, "key-zset", "0", "(2", int64(2))
+
+	ac.ez.ZScanEqual(t, "key-zset", "0", "*", 2, "member2 member4 -3.5 member5 0")
+	ac.ez.ZScanEqual(t, "key-zset", "member2", "member*", 2, "member11 member2 1.5 member1 2")
+
 	ac.ez.ZRemEqual(t, "key-zset", "member2", "member1", "member3", "member4", "member1")
 	ac.ez.ZRangeEqual(t, "key-zset", 0, -1, true)
 
diff --git a/tools/autotest/cmd/zset.go b/tools/autotest/cmd/zset.go
index 70a5bd4f..c2f51169 100644
--- a/tools/autotest/cmd/zset.go
+++ b/tools/autotest/cmd/zset.go
@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"fmt"
 	"sort"
 	"strconv"
 	"strings"
@@ -174,6 +175,45 @@ func (ez *ExampleZSet) ZRevRangeEqualErr(t *testing.T, errValue string, args ...
 	assert.EqualError(t, err, errValue)
 }
 
+func (ez *ExampleZSet) ZScanEqual(t *testing.T, key string, cursor string, pattern string, count int, expected string) {
+	cmd := "zscan"
+	req := make([]interface{}, 0)
+	req = append(req, key)
+	req = append(req, cursor)
+	req = append(req, "match", pattern)
+	req = append(req, "count", count)
+
+	reply, err := redis.MultiBulk(ez.conn.Do(cmd, req...))
+	lastCursor, _ := redis.String(reply[0], err)
+	strs, _ := redis.Strings(reply[1], err)
+	fmt.Println(lastCursor, strs)
+	if expected != "" {
+		expectedStrs := strings.Split(expected, " ")
+		assert.Equal(t, expectedStrs[0], lastCursor)
+		assert.Equal(t, expectedStrs[1:], strs)
+	} else {
+		assert.Equal(t, "0", lastCursor)
+	}
+	assert.Nil(t, err)
+}
+
+func (ez *ExampleZSet) ZCountEqual(t *testing.T, key string, start string, stop string, expected int64) {
+	cmd := "zcount"
+	req := make([]interface{}, 0)
+	req = append(req, key)
+	req = append(req, start)
+	req = append(req, stop)
+
+	reply, err := redis.Int64(ez.conn.Do(cmd, req...))
+	assert.Equal(t, expected, reply)
+	assert.Nil(t, err)
+}
+
+func (ez *ExampleZSet) ZCountEqualErr(t *testing.T, errValue string, args ...interface{}) {
+	_, err := ez.conn.Do("zcount", args...)
+	assert.EqualError(t, err, errValue)
+}
+
 func (ez *ExampleZSet) ZRangeByScoreEqual(t *testing.T, key string, start string, stop string, withScores bool, limit string, expected string) {
 	ez.ZAnyOrderRangeByScoreEqual(t, key, start, stop, withScores, true, limit, expected)
 }