diff --git a/model/convert.go b/model/convert.go
new file mode 100644
index 0000000..ab1f011
--- /dev/null
+++ b/model/convert.go
@@ -0,0 +1,39 @@
+package model
+
+import (
+	"encoding/json"
+	"sync"
+)
+
+func JsonByteToSyncSession(jsonByte []byte) (*SyncSession, error) {
+	s := &Session{}
+	err := json.Unmarshal(jsonByte, s)
+	if err != nil {
+		return nil, err
+	}
+
+	return ConvertSyncSession(s), nil
+}
+
+func JsonToSyncSession(jsonStr string) (*SyncSession, error) {
+	return JsonByteToSyncSession([]byte(jsonStr))
+}
+
+// ConvertSyncSession convert to Session
+func ConvertSyncSession(s *Session) *SyncSession {
+	session := &SyncSession{
+		Id:            s.Id,
+		Type:          s.Type,
+		LoginType:     s.LoginType,
+		LoginId:       s.LoginId,
+		Token:         s.Token,
+		CreateTime:    s.CreateTime,
+		DataMap:       &sync.Map{},
+		TokenSignList: s.TokenSignList,
+	}
+	// copy DataMap
+	for k, v := range s.DataMap {
+		session.DataMap.Store(k, v)
+	}
+	return session
+}
diff --git a/model/session.go b/model/session.go
index 1a96bba..926cf77 100644
--- a/model/session.go
+++ b/model/session.go
@@ -3,7 +3,6 @@ package model
 import (
 	"container/list"
 	"encoding/json"
-	"sync"
 	"time"
 )
 
@@ -19,13 +18,14 @@ type Session struct {
 	LoginId       string
 	Token         string
 	CreateTime    int64
-	DataMap       *sync.Map
+	DataMap       map[string]interface{}
 	TokenSignList []*TokenSign `json:"TokenSignList"`
 }
 
 func DefaultSession(id string) *Session {
 	return &Session{
 		Id:            id,
+		DataMap:       make(map[string]interface{}),
 		CreateTime:    time.Now().UnixMilli(),
 		TokenSignList: make([]*TokenSign, 0),
 	}
@@ -37,6 +37,7 @@ func NewSession(id string, sessionType string, loginId string) *Session {
 		Type:          sessionType,
 		LoginId:       loginId,
 		CreateTime:    time.Now().UnixMilli(),
+		DataMap:       make(map[string]interface{}),
 		TokenSignList: make([]*TokenSign, 0),
 	}
 }
@@ -131,8 +132,9 @@ func (s *Session) Json() string {
 	return string(b)
 }
 
+// Get returns data from DataMap
 func (s *Session) Get(key string) interface{} {
-	value, ok := s.DataMap.Load(key)
+	value, ok := s.DataMap[key]
 	if !ok {
 		return nil
 	}
@@ -140,5 +142,17 @@ func (s *Session) Get(key string) interface{} {
 }
 
 func (s *Session) Set(key string, obj interface{}) {
-	s.DataMap.Store(key, obj)
+	s.DataMap[key] = obj
+}
+
+// GetOrSet returns the existing value for the key if present.
+// Otherwise, it stores and returns the given value.
+// The loaded result is true if the value was loaded, false if stored.
+func (s *Session) GetOrSet(key string, obj interface{}) (interface{}, bool) {
+	value := s.Get(key)
+	if value == nil {
+		s.Set(key, obj)
+		return obj, false
+	}
+	return value, true
 }
diff --git a/model/sync_session.go b/model/sync_session.go
new file mode 100644
index 0000000..cba966c
--- /dev/null
+++ b/model/sync_session.go
@@ -0,0 +1,177 @@
+package model
+
+import (
+	"container/list"
+	"encoding/json"
+	"fmt"
+	"sync"
+	"time"
+)
+
+// SyncSession sync SyncSession
+type SyncSession struct {
+	Id            string
+	Type          string
+	LoginType     string
+	LoginId       string
+	Token         string
+	CreateTime    int64
+	DataMap       *sync.Map
+	TokenSignList []*TokenSign `json:"TokenSignList"`
+}
+
+func DefaultSyncSession(id string) *SyncSession {
+	return &SyncSession{
+		Id:            id,
+		DataMap:       &sync.Map{},
+		CreateTime:    time.Now().UnixMilli(),
+		TokenSignList: make([]*TokenSign, 0),
+	}
+}
+
+func NewSyncSession(id string, sessionType string, loginId string) *SyncSession {
+	return &SyncSession{
+		Id:            id,
+		Type:          sessionType,
+		LoginId:       loginId,
+		CreateTime:    time.Now().UnixMilli(),
+		DataMap:       &sync.Map{},
+		TokenSignList: make([]*TokenSign, 0),
+	}
+}
+
+// GetFilterTokenSign filter by TokenSign.Device from all TokenSign
+func (s *SyncSession) GetFilterTokenSign(device string) *list.List {
+	if device == "" {
+		return s.GetTokenSignListCopy()
+	}
+	copyList := list.New()
+	for _, tokenSign := range s.TokenSignList {
+		if tokenSign.Device == device {
+			copyList.PushBack(tokenSign)
+		}
+	}
+	return copyList
+}
+
+// GetTokenSignListCopy find all TokenSign
+func (s *SyncSession) GetTokenSignListCopy() *list.List {
+	copyList := list.New()
+	for _, tokenSign := range s.TokenSignList {
+		copyList.PushBack(tokenSign)
+	}
+	return copyList
+}
+
+// GetTokenSign find TokenSign by TokenSign.Value
+func (s *SyncSession) GetTokenSign(tokenValue string) *TokenSign {
+	if tokenValue == "" {
+		return nil
+	}
+	for _, tokenSign := range s.TokenSignList {
+		if tokenSign.Value == tokenValue {
+			return tokenSign
+		}
+	}
+	return nil
+}
+
+// AddTokenSign add TokenSign
+func (s *SyncSession) AddTokenSign(sign *TokenSign) {
+	if s.GetTokenSign(sign.Value) != nil {
+		return
+	}
+	s.TokenSignList = append(s.TokenSignList, sign)
+}
+
+// RemoveTokenSign remove TokenSign by TokenSign.Value
+func (s *SyncSession) RemoveTokenSign(tokenValue string) bool {
+	if tokenValue == "" {
+		return false
+	}
+	for i, tokenSign := range s.TokenSignList {
+		if tokenSign.Value == tokenValue {
+			// delete
+			s.RemoveTokenSignByIndex(i)
+			return true
+		}
+	}
+	return true
+}
+
+// RemoveTokenSignByIndex delete by index
+func (s *SyncSession) RemoveTokenSignByIndex(i int) {
+	s.TokenSignList = append(s.TokenSignList[:i], s.TokenSignList[i+1:]...)
+}
+
+// GetLastTokenByDevice get TokenSign.Value by device
+func (s *SyncSession) GetLastTokenByDevice(device string) string {
+	if device == "" {
+		return ""
+	}
+	tokenSignList := s.GetFilterTokenSign(device)
+	if tokenSign, ok := tokenSignList.Back().Value.(*TokenSign); ok && tokenSign.Device == device {
+		return tokenSign.Value
+	}
+	return ""
+}
+
+// TokenSignSize get tokenSign size
+func (s *SyncSession) TokenSignSize() int {
+	return len(s.TokenSignList)
+}
+
+// Json return json string
+func (s *SyncSession) Json() string {
+	myStruct := &Session{
+		Id:            s.Id,
+		Type:          s.Type,
+		LoginType:     s.LoginType,
+		LoginId:       s.LoginId,
+		Token:         s.Token,
+		CreateTime:    s.CreateTime,
+		TokenSignList: s.TokenSignList,
+		DataMap:       make(map[string]interface{}),
+	}
+
+	s.DataMap.Range(func(key, value any) bool {
+		myStruct.DataMap[fmt.Sprintf("%v", key)] = value
+		return true
+	})
+
+	b, err := json.Marshal(myStruct)
+	if err != nil {
+		return ""
+	}
+	return string(b)
+}
+
+// UnmarshalBytes convert bytes to SyncSession
+func (s *SyncSession) UnmarshalBytes(jsonByte []byte) (*SyncSession, error) {
+	return JsonByteToSyncSession(jsonByte)
+}
+
+// UnmarshalStr convert string to SyncSession
+func (s *SyncSession) UnmarshalStr(jsonStr string) (*SyncSession, error) {
+	return JsonToSyncSession(jsonStr)
+}
+
+// Get returns data from DataMap
+func (s *SyncSession) Get(key string) interface{} {
+	value, ok := s.DataMap.Load(key)
+	if !ok {
+		return nil
+	}
+	return value
+}
+
+func (s *SyncSession) Set(key string, obj interface{}) {
+	s.DataMap.Store(key, obj)
+}
+
+// GetOrSet returns the existing value for the key if present.
+// Otherwise, it stores and returns the given value.
+// The loaded result is true if the value was loaded, false if stored.
+func (s *SyncSession) GetOrSet(key string, obj interface{}) (interface{}, bool) {
+	return s.DataMap.LoadOrStore(key, obj)
+}