diff --git a/configs/advanced/master.yaml b/configs/advanced/master.yaml
index 4c077af88679b28e62a3ad0b57250cbbe272bd4a..e0837042d60e13adb5e2c1dae7732d7e98b6ca15 100644
--- a/configs/advanced/master.yaml
+++ b/configs/advanced/master.yaml
@@ -20,7 +20,4 @@ master:
     minIDAssignCnt: 1024
     maxIDAssignCnt: 16384
     # old name: segmentExpireDuration: 2000
-    IDAssignExpiration: 2000 # ms
-
-  maxPartitionNum: 4096
-  defaultPartitionTag: _default
\ No newline at end of file
+    IDAssignExpiration: 2000 # ms
\ No newline at end of file
diff --git a/configs/advanced/proxy.yaml b/configs/advanced/proxy.yaml
index 0d3163c0d1122dfe1e7998f33aba0b403f7e3b27..cc98ad4d85ed10ec7ddbc517d35eeae1eed0528f 100644
--- a/configs/advanced/proxy.yaml
+++ b/configs/advanced/proxy.yaml
@@ -28,4 +28,3 @@ proxy:
       bufSize: 512
 
   maxNameLength: 255
-  maxFieldNum: 64
\ No newline at end of file
diff --git a/internal/master/meta_table.go b/internal/master/meta_table.go
index 991828a9cb24897b5bb83b9b02dd88fad871d8cf..7a46f6e254159b4a94a0d26c6382c6a8941a4682 100644
--- a/internal/master/meta_table.go
+++ b/internal/master/meta_table.go
@@ -52,7 +52,7 @@ func (mt *metaTable) reloadFromKV() error {
 
 	for _, value := range values {
 		tenantMeta := pb.TenantMeta{}
-		err := proto.Unmarshal([]byte(value), &tenantMeta)
+		err := proto.UnmarshalText(value, &tenantMeta)
 		if err != nil {
 			return err
 		}
@@ -66,7 +66,7 @@ func (mt *metaTable) reloadFromKV() error {
 
 	for _, value := range values {
 		proxyMeta := pb.ProxyMeta{}
-		err = proto.Unmarshal([]byte(value), &proxyMeta)
+		err = proto.UnmarshalText(value, &proxyMeta)
 		if err != nil {
 			return err
 		}
@@ -80,7 +80,7 @@ func (mt *metaTable) reloadFromKV() error {
 
 	for _, value := range values {
 		collectionMeta := pb.CollectionMeta{}
-		err = proto.Unmarshal([]byte(value), &collectionMeta)
+		err = proto.UnmarshalText(value, &collectionMeta)
 		if err != nil {
 			return err
 		}
@@ -95,7 +95,7 @@ func (mt *metaTable) reloadFromKV() error {
 
 	for _, value := range values {
 		segmentMeta := pb.SegmentMeta{}
-		err = proto.Unmarshal([]byte(value), &segmentMeta)
+		err = proto.UnmarshalText(value, &segmentMeta)
 		if err != nil {
 			return err
 		}
@@ -107,10 +107,7 @@ func (mt *metaTable) reloadFromKV() error {
 
 // metaTable.ddLock.Lock() before call this function
 func (mt *metaTable) saveCollectionMeta(coll *pb.CollectionMeta) error {
-	collBytes, err := proto.Marshal(coll)
-	if err != nil {
-		return err
-	}
+	collBytes := proto.MarshalTextString(coll)
 	mt.collID2Meta[coll.ID] = *coll
 	mt.collName2ID[coll.Schema.Name] = coll.ID
 	return mt.client.Save("/collection/"+strconv.FormatInt(coll.ID, 10), string(collBytes))
@@ -118,10 +115,7 @@ func (mt *metaTable) saveCollectionMeta(coll *pb.CollectionMeta) error {
 
 // metaTable.ddLock.Lock() before call this function
 func (mt *metaTable) saveSegmentMeta(seg *pb.SegmentMeta) error {
-	segBytes, err := proto.Marshal(seg)
-	if err != nil {
-		return err
-	}
+	segBytes := proto.MarshalTextString(seg)
 
 	mt.segID2Meta[seg.SegmentID] = *seg
 
@@ -136,10 +130,7 @@ func (mt *metaTable) saveCollectionAndDeleteSegmentsMeta(coll *pb.CollectionMeta
 	}
 
 	kvs := make(map[string]string)
-	collStrs, err := proto.Marshal(coll)
-	if err != nil {
-		return err
-	}
+	collStrs := proto.MarshalTextString(coll)
 
 	kvs["/collection/"+strconv.FormatInt(coll.ID, 10)] = string(collStrs)
 
@@ -159,19 +150,15 @@ func (mt *metaTable) saveCollectionAndDeleteSegmentsMeta(coll *pb.CollectionMeta
 // metaTable.ddLock.Lock() before call this function
 func (mt *metaTable) saveCollectionsAndSegmentsMeta(coll *pb.CollectionMeta, seg *pb.SegmentMeta) error {
 	kvs := make(map[string]string)
-	collBytes, err := proto.Marshal(coll)
-	if err != nil {
-		return err
-	}
+	collBytes := proto.MarshalTextString(coll)
+
 	kvs["/collection/"+strconv.FormatInt(coll.ID, 10)] = string(collBytes)
 
 	mt.collID2Meta[coll.ID] = *coll
 	mt.collName2ID[coll.Schema.Name] = coll.ID
 
-	segBytes, err := proto.Marshal(seg)
-	if err != nil {
-		return err
-	}
+	segBytes := proto.MarshalTextString(seg)
+
 	kvs["/segment/"+strconv.FormatInt(seg.SegmentID, 10)] = string(segBytes)
 
 	mt.segID2Meta[seg.SegmentID] = *seg
@@ -220,7 +207,7 @@ func (mt *metaTable) AddCollection(coll *pb.CollectionMeta) error {
 	}
 
 	if len(coll.PartitionTags) == 0 {
-		coll.PartitionTags = append(coll.PartitionTags, Params.DefaultPartitionTag)
+		coll.PartitionTags = append(coll.PartitionTags, "default")
 	}
 	_, ok := mt.collName2ID[coll.Schema.Name]
 	if ok {
@@ -292,10 +279,6 @@ func (mt *metaTable) AddPartition(collID UniqueID, tag string) error {
 		return errors.Errorf("can't find collection. id = " + strconv.FormatInt(collID, 10))
 	}
 
-	// number of partition tags (except _default) should be limited to 4096 by default
-	if int64(len(coll.PartitionTags)) > Params.MaxPartitionNum {
-		return errors.New("maximum partition's number should be limit to " + strconv.FormatInt(Params.MaxPartitionNum, 10))
-	}
 	for _, t := range coll.PartitionTags {
 		if t == tag {
 			return errors.Errorf("partition already exists.")
@@ -330,29 +313,17 @@ func (mt *metaTable) DeletePartition(collID UniqueID, tag string) error {
 	mt.ddLock.Lock()
 	defer mt.ddLock.Unlock()
 
-	if tag == Params.DefaultPartitionTag {
-		return errors.New("default partition cannot be deleted")
-	}
-
 	collMeta, ok := mt.collID2Meta[collID]
 	if !ok {
 		return errors.Errorf("can't find collection. id = " + strconv.FormatInt(collID, 10))
 	}
 
-	// check tag exists
-	exist := false
-
 	pt := make([]string, 0, len(collMeta.PartitionTags))
 	for _, t := range collMeta.PartitionTags {
 		if t != tag {
 			pt = append(pt, t)
-		} else {
-			exist = true
 		}
 	}
-	if !exist {
-		return errors.New("partition " + tag + " does not exist")
-	}
 	if len(pt) == len(collMeta.PartitionTags) {
 		return nil
 	}
diff --git a/internal/master/meta_table_test.go b/internal/master/meta_table_test.go
index 13482124d0bb53e311544abb22cdbabd7973a8fe..674b0162594bbf3c5a1e5dcfccc02435feb53dfb 100644
--- a/internal/master/meta_table_test.go
+++ b/internal/master/meta_table_test.go
@@ -3,7 +3,6 @@ package master
 import (
 	"context"
 	"reflect"
-	"strconv"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -239,10 +238,6 @@ func TestMetaTable_DeletePartition(t *testing.T) {
 	assert.Equal(t, 1, len(meta.collName2ID))
 	assert.Equal(t, 1, len(meta.collID2Meta))
 	assert.Equal(t, 1, len(meta.segID2Meta))
-
-	// delete not exist
-	err = meta.DeletePartition(100, "not_exist")
-	assert.NotNil(t, err)
 }
 
 func TestMetaTable_Segment(t *testing.T) {
@@ -371,39 +366,3 @@ func TestMetaTable_UpdateSegment(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, seg.NumRows, int64(210))
 }
-
-func TestMetaTable_AddPartition_Limit(t *testing.T) {
-	Init()
-	Params.MaxPartitionNum = 256 // adding 4096 partitions is too slow
-	etcdAddr := Params.EtcdAddress
-
-	cli, err := clientv3.New(clientv3.Config{Endpoints: []string{etcdAddr}})
-	assert.Nil(t, err)
-	etcdKV := kv.NewEtcdKV(cli, "/etcd/test/root")
-
-	_, err = cli.Delete(context.TODO(), "/etcd/test/root", clientv3.WithPrefix())
-	assert.Nil(t, err)
-
-	meta, err := NewMetaTable(etcdKV)
-	assert.Nil(t, err)
-	defer meta.client.Close()
-
-	colMeta := pb.CollectionMeta{
-		ID: 100,
-		Schema: &schemapb.CollectionSchema{
-			Name: "coll1",
-		},
-		CreateTime:    0,
-		SegmentIDs:    []UniqueID{},
-		PartitionTags: []string{},
-	}
-	err = meta.AddCollection(&colMeta)
-	assert.Nil(t, err)
-
-	for i := 0; i < int(Params.MaxPartitionNum); i++ {
-		err := meta.AddPartition(100, "partition_"+strconv.Itoa(i))
-		assert.Nil(t, err)
-	}
-	err = meta.AddPartition(100, "partition_limit")
-	assert.NotNil(t, err)
-}
diff --git a/internal/master/param_table.go b/internal/master/param_table.go
index 2d32f2e769bbe11ff094e28d88de6a7287b3906b..872bdab34eaf5d12f66e20a101cf24ee3fe6f561 100644
--- a/internal/master/param_table.go
+++ b/internal/master/param_table.go
@@ -43,9 +43,6 @@ type ParamTable struct {
 	K2SChannelNames               []string
 	QueryNodeStatsChannelName     string
 	MsgChannelSubName             string
-
-	MaxPartitionNum     int64
-	DefaultPartitionTag string
 }
 
 var Params ParamTable
@@ -94,8 +91,6 @@ func (p *ParamTable) Init() {
 	p.initK2SChannelNames()
 	p.initQueryNodeStatsChannelName()
 	p.initMsgChannelSubName()
-	p.initMaxPartitionNum()
-	p.initDefaultPartitionTag()
 }
 
 func (p *ParamTable) initAddress() {
@@ -416,24 +411,3 @@ func (p *ParamTable) initK2SChannelNames() {
 	}
 	p.K2SChannelNames = channels
 }
-
-func (p *ParamTable) initMaxPartitionNum() {
-	str, err := p.Load("master.maxPartitionNum")
-	if err != nil {
-		panic(err)
-	}
-	maxPartitionNum, err := strconv.ParseInt(str, 10, 64)
-	if err != nil {
-		panic(err)
-	}
-	p.MaxPartitionNum = maxPartitionNum
-}
-
-func (p *ParamTable) initDefaultPartitionTag() {
-	defaultTag, err := p.Load("master.defaultPartitionTag")
-	if err != nil {
-		panic(err)
-	}
-
-	p.DefaultPartitionTag = defaultTag
-}
diff --git a/internal/master/partition_task.go b/internal/master/partition_task.go
index 80a339b2fcc42601d43a03729dd31630c507af2b..28636c930c744e71b902721485d533cb4577e73c 100644
--- a/internal/master/partition_task.go
+++ b/internal/master/partition_task.go
@@ -191,12 +191,10 @@ func (t *showPartitionTask) Execute() error {
 		return errors.New("null request")
 	}
 
-	collMeta, err := t.mt.GetCollectionByName(t.req.CollectionName.CollectionName)
-	if err != nil {
-		return err
-	}
 	partitions := make([]string, 0)
-	partitions = append(partitions, collMeta.PartitionTags...)
+	for _, collection := range t.mt.collID2Meta {
+		partitions = append(partitions, collection.PartitionTags...)
+	}
 
 	stringListResponse := servicepb.StringListResponse{
 		Status: &commonpb.Status{
diff --git a/internal/master/partition_task_test.go b/internal/master/partition_task_test.go
index 53b698e64a555b579bdaca20d8469a6f324b1d01..cd784f9780658f3e05bd4353bb0e8f98d379bb9d 100644
--- a/internal/master/partition_task_test.go
+++ b/internal/master/partition_task_test.go
@@ -60,9 +60,6 @@ func TestMaster_Partition(t *testing.T) {
 		K2SChannelNames:               []string{"k2s0", "k2s1"},
 		QueryNodeStatsChannelName:     "statistic",
 		MsgChannelSubName:             Params.MsgChannelSubName,
-
-		MaxPartitionNum:     int64(4096),
-		DefaultPartitionTag: "_default",
 	}
 
 	port := 10000 + rand.Intn(1000)
@@ -215,7 +212,7 @@ func TestMaster_Partition(t *testing.T) {
 
 	//assert.Equal(t, collMeta.PartitionTags[0], "partition1")
 	//assert.Equal(t, collMeta.PartitionTags[1], "partition2")
-	assert.ElementsMatch(t, []string{"_default", "partition1", "partition2"}, collMeta.PartitionTags)
+	assert.ElementsMatch(t, []string{"default", "partition1", "partition2"}, collMeta.PartitionTags)
 
 	showPartitionReq := internalpb.ShowPartitionRequest{
 		MsgType:        internalpb.MsgType_kShowPartitions,
@@ -227,7 +224,7 @@ func TestMaster_Partition(t *testing.T) {
 
 	stringList, err := cli.ShowPartitions(ctx, &showPartitionReq)
 	assert.Nil(t, err)
-	assert.ElementsMatch(t, []string{"_default", "partition1", "partition2"}, stringList.Values)
+	assert.ElementsMatch(t, []string{"default", "partition1", "partition2"}, stringList.Values)
 
 	showPartitionReq = internalpb.ShowPartitionRequest{
 		MsgType:        internalpb.MsgType_kShowPartitions,
diff --git a/internal/master/segment_manager_test.go b/internal/master/segment_manager_test.go
index 85942bdd62e0beda68faeab0d10876db026e731d..7063647be7ed51bee8d9d5d158f79e897c0e1cf9 100644
--- a/internal/master/segment_manager_test.go
+++ b/internal/master/segment_manager_test.go
@@ -261,9 +261,6 @@ func startupMaster() {
 		K2SChannelNames:               []string{"k2s0", "k2s1"},
 		QueryNodeStatsChannelName:     "statistic",
 		MsgChannelSubName:             Params.MsgChannelSubName,
-
-		MaxPartitionNum:     int64(4096),
-		DefaultPartitionTag: "_default",
 	}
 
 	master, err = CreateServer(ctx)
diff --git a/internal/proxy/paramtable.go b/internal/proxy/paramtable.go
index 791927777dfea0bbdc52b78e126b8faba723c520..c53c84509650cb73f2909f994cdd782b40d41bc4 100644
--- a/internal/proxy/paramtable.go
+++ b/internal/proxy/paramtable.go
@@ -463,15 +463,3 @@ func (pt *ParamTable) MaxNameLength() int64 {
 	}
 	return maxNameLength
 }
-
-func (pt *ParamTable) MaxFieldNum() int64 {
-	str, err := pt.Load("proxy.maxFieldNum")
-	if err != nil {
-		panic(err)
-	}
-	maxFieldNum, err := strconv.ParseInt(str, 10, 64)
-	if err != nil {
-		panic(err)
-	}
-	return maxFieldNum
-}
diff --git a/internal/proxy/task.go b/internal/proxy/task.go
index 1d23ddaafda62e9d70c1b6740b410abc4591848d..65e4e214ee1a4ad9bafcce5392a997ce733a7696 100644
--- a/internal/proxy/task.go
+++ b/internal/proxy/task.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"log"
-	"strconv"
 
 	"github.com/golang/protobuf/proto"
 	"github.com/zilliztech/milvus-distributed/internal/allocator"
@@ -165,10 +164,6 @@ func (cct *CreateCollectionTask) SetTs(ts Timestamp) {
 }
 
 func (cct *CreateCollectionTask) PreExecute() error {
-	if int64(len(cct.schema.Fields)) > Params.MaxFieldNum() {
-		return errors.New("maximum field's number should be limited to " + strconv.FormatInt(Params.MaxFieldNum(), 10))
-	}
-
 	// validate collection name
 	if err := ValidateCollectionName(cct.schema.Name); err != nil {
 		return err
diff --git a/internal/proxy/validate_util.go b/internal/proxy/validate_util.go
index 4f892603f954f9faf8d996ef890f98414615746a..8049595f289ea74a78b1ab39ff7b3dbef241f30b 100644
--- a/internal/proxy/validate_util.go
+++ b/internal/proxy/validate_util.go
@@ -68,7 +68,7 @@ func ValidatePartitionTag(partitionTag string, strictCheck bool) error {
 
 	if strictCheck {
 		firstChar := partitionTag[0]
-		if firstChar != '_' && !isAlpha(firstChar) && !isNumber(firstChar) {
+		if firstChar != '_' && !isAlpha(firstChar) {
 			msg := invalidMsg + "The first character of a partition tag must be an underscore or letter."
 			return errors.New(msg)
 		}