diff --git a/internal/syncdrive/bolt_db_test.go b/internal/syncdrive/bolt_db_test.go
index 8399ae8..32f6068 100644
--- a/internal/syncdrive/bolt_db_test.go
+++ b/internal/syncdrive/bolt_db_test.go
@@ -1,11 +1,80 @@
 package syncdrive
 
 import (
+	"context"
 	"fmt"
 	"path"
+	"strings"
 	"testing"
+	"time"
 )
 
 func TestPath(t *testing.T) {
 	fmt.Println(path.Dir("/dsgsdghsd/dsgsdh/eg34/dghsh"))
 }
+
+func dosomething(ctx context.Context) {
+	for {
+		select {
+		case <-ctx.Done():
+			fmt.Println("playing")
+			return
+		default:
+			fmt.Println("I am working!")
+			time.Sleep(time.Second)
+		}
+	}
+}
+
+func TestContext(t *testing.T) {
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	go func() {
+		time.Sleep(5 * time.Second)
+		cancelFunc()
+	}()
+	dosomething(ctx)
+}
+
+func TestBolt(t *testing.T) {
+	localFileDb := NewLocalSyncDb("D:\\smb\\feny\\goprojects\\dev\\sync_drive\\local.db")
+	localFileDb.Open()
+	defer localFileDb.Close()
+	localFileDb.Add(&LocalFileItem{
+		FileName:      "file1.db",
+		FileSize:      0,
+		FileType:      "file",
+		CreatedAt:     "2022-05-12 10:21:14",
+		UpdatedAt:     "2022-05-12 10:21:14",
+		FileExtension: ".db",
+		Sha1Hash:      "",
+		Path:          "D:\\smb\\feny\\goprojects\\dev\\file1.db",
+	})
+	go func(db LocalSyncDb) {
+		for i := 1; i <= 10; i++ {
+			sb := &strings.Builder{}
+			fmt.Fprintf(sb, "D:\\smb\\feny\\goprojects\\dev\\go\\file%d.db", i)
+			db.Add(&LocalFileItem{
+				FileName:      "file1.db",
+				FileSize:      0,
+				FileType:      "file",
+				CreatedAt:     "2022-05-12 10:21:14",
+				UpdatedAt:     "2022-05-12 10:21:14",
+				FileExtension: ".db",
+				Sha1Hash:      "",
+				Path:          sb.String(),
+			})
+		}
+	}(localFileDb)
+	time.Sleep(1 * time.Second)
+	localFileDb.Add(&LocalFileItem{
+		FileName:      "file1.db",
+		FileSize:      0,
+		FileType:      "file",
+		CreatedAt:     "2022-05-12 10:21:14",
+		UpdatedAt:     "2022-05-12 10:21:14",
+		FileExtension: ".db",
+		Sha1Hash:      "",
+		Path:          "D:\\smb\\feny\\goprojects\\dev\\file3.db",
+	})
+	time.Sleep(5 * time.Second)
+}
diff --git a/internal/syncdrive/file_action_task.go b/internal/syncdrive/file_action_task.go
new file mode 100644
index 0000000..264ab17
--- /dev/null
+++ b/internal/syncdrive/file_action_task.go
@@ -0,0 +1,49 @@
+package syncdrive
+
+type (
+	FileAction     string
+	FileActionTask struct {
+		Action    FileAction
+		LocalFile *LocalFileItem
+		PanFile   *PanFileItem
+	}
+
+	FileActionTaskExecutor struct {
+		localFileDb LocalSyncDb
+		panFileDb   PanSyncDb
+	}
+
+	FileActionTaskManager struct {
+		FileActionTaskList []*FileActionTask
+
+		localFileDb LocalSyncDb
+		panFileDb   PanSyncDb
+	}
+)
+
+const (
+	DownloadFile    FileAction = "DownloadFile"
+	UploadFile      FileAction = "UploadFile"
+	DeleteLocalFile FileAction = "DeleteLocalFile"
+	DeletePanFile   FileAction = "DeletePanFile"
+)
+
+func (f *FileActionTask) DoAction() error {
+	return nil
+}
+
+func (f *FileActionTask) DownloadFile() error {
+	return nil
+}
+
+func (f *FileActionTask) UploadFile() error {
+	return nil
+}
+
+func (f *FileActionTask) DeleteLocalFile() error {
+	return nil
+}
+
+func (f *FileActionTask) DeletePanFile() error {
+	return nil
+}
diff --git a/internal/syncdrive/sync_db_bolt.go b/internal/syncdrive/sync_db_bolt.go
index 079c9ca..70d7ba1 100644
--- a/internal/syncdrive/sync_db_bolt.go
+++ b/internal/syncdrive/sync_db_bolt.go
@@ -35,8 +35,7 @@ func newPanSyncDbBolt(dbFilePath string) *PanSyncDbBolt {
 }
 
 func (p *PanSyncDbBolt) Open() (bool, error) {
-	p.db = NewBoltDb(p.Path)
-	return p.db.Open()
+	return true, nil
 }
 
 // Add 增加一个数据项
@@ -47,6 +46,10 @@ func (p *PanSyncDbBolt) Add(item *PanFileItem) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	data, err := json.Marshal(item)
 	if err != nil {
 		return false, err
@@ -66,6 +69,10 @@ func (p *PanSyncDbBolt) AddFileList(items PanFileList) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	boltItems := []*BoltItem{}
 	for _, item := range items {
 		data, err := json.Marshal(item)
@@ -90,6 +97,10 @@ func (p *PanSyncDbBolt) Get(filePath string) (*PanFileItem, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	data, err := p.db.Get(filePath)
 	if err == nil && data != "" {
 		item := &PanFileItem{}
@@ -109,6 +120,10 @@ func (p *PanSyncDbBolt) GetFileList(filePath string) (PanFileList, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	panFileList := PanFileList{}
 	dataList, err := p.db.GetFileList(filePath)
 	if err == nil && len(dataList) > 0 {
@@ -136,6 +151,10 @@ func (p *PanSyncDbBolt) Delete(filePath string) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	return p.db.Delete(filePath)
 }
 
@@ -147,6 +166,10 @@ func (p *PanSyncDbBolt) Update(item *PanFileItem) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	data, err := json.Marshal(item)
 	if err != nil {
 		return false, err
@@ -156,9 +179,7 @@ func (p *PanSyncDbBolt) Update(item *PanFileItem) (bool, error) {
 
 // Close 关闭数据库
 func (p *PanSyncDbBolt) Close() (bool, error) {
-	p.locker.Lock()
-	defer p.locker.Unlock()
-	return p.db.Close()
+	return true, nil
 }
 
 func newLocalSyncDbBolt(dbFilePath string) *LocalSyncDbBolt {
@@ -169,8 +190,7 @@ func newLocalSyncDbBolt(dbFilePath string) *LocalSyncDbBolt {
 }
 
 func (p *LocalSyncDbBolt) Open() (bool, error) {
-	p.db = NewBoltDb(p.Path)
-	return p.db.Open()
+	return true, nil
 }
 
 // Add 增加一个数据项
@@ -181,6 +201,10 @@ func (p *LocalSyncDbBolt) Add(item *LocalFileItem) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	data, err := json.Marshal(item)
 	if err != nil {
 		return false, err
@@ -200,6 +224,10 @@ func (p *LocalSyncDbBolt) AddFileList(items LocalFileList) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	boltItems := []*BoltItem{}
 	for _, item := range items {
 		data, err := json.Marshal(item)
@@ -224,6 +252,10 @@ func (p *LocalSyncDbBolt) Get(filePath string) (*LocalFileItem, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	data, err := p.db.Get(filePath)
 	if err == nil && data != "" {
 		item := &LocalFileItem{}
@@ -243,6 +275,10 @@ func (p *LocalSyncDbBolt) GetFileList(filePath string) (LocalFileList, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	LocalFileList := LocalFileList{}
 	dataList, err := p.db.GetFileList(filePath)
 	if err == nil && len(dataList) > 0 {
@@ -269,7 +305,9 @@ func (p *LocalSyncDbBolt) Delete(filePath string) (bool, error) {
 	}
 	p.locker.Lock()
 	defer p.locker.Unlock()
-
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
 	return p.db.Delete(filePath)
 }
 
@@ -281,6 +319,10 @@ func (p *LocalSyncDbBolt) Update(item *LocalFileItem) (bool, error) {
 	p.locker.Lock()
 	defer p.locker.Unlock()
 
+	p.db = NewBoltDb(p.Path)
+	p.db.Open()
+	defer p.db.Close()
+
 	data, err := json.Marshal(item)
 	if err != nil {
 		return false, err
@@ -290,7 +332,5 @@ func (p *LocalSyncDbBolt) Update(item *LocalFileItem) (bool, error) {
 
 // Close 关闭数据库
 func (p *LocalSyncDbBolt) Close() (bool, error) {
-	p.locker.Lock()
-	defer p.locker.Unlock()
-	return p.db.Close()
+	return true, nil
 }
diff --git a/internal/syncdrive/sync_db_test.go b/internal/syncdrive/sync_db_test.go
index 81dabad..b06388e 100644
--- a/internal/syncdrive/sync_db_test.go
+++ b/internal/syncdrive/sync_db_test.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/tickstep/aliyunpan-api/aliyunpan"
 	"github.com/tickstep/aliyunpan-api/aliyunpan/apierror"
+	"github.com/tickstep/aliyunpan/internal/utils"
 	"github.com/tickstep/library-go/logger"
 	"io/ioutil"
 	"os"
@@ -182,11 +183,11 @@ func TestLocalSyncDbAddFileList(t *testing.T) {
 }
 
 func TestLocalGet(t *testing.T) {
-	b := NewLocalSyncDb("D:\\smb\\feny\\goprojects\\dev\\local.db")
+	b := NewLocalSyncDb("/Volumes/Downloads/dev/sync_drive/840f28af799747848c0b3155e0bdfeab/local.bolt")
 	b.Open()
 	defer b.Close()
-
-	fmt.Println(b.Get("D:\\smb\\feny\\goprojects\\dl\\a761171495\\1.jpg"))
+	v, _ := b.Get("/Volumes/Downloads/dev/upload/未命名文件夹/[HAIDAN.VIDEO].绣春刀.2014.mp4.torrent")
+	fmt.Println(utils.ObjectToJsonStr(v))
 }
 
 func TestLocalGetFileList(t *testing.T) {
diff --git a/internal/syncdrive/sync_task.go b/internal/syncdrive/sync_task.go
new file mode 100644
index 0000000..1e366f0
--- /dev/null
+++ b/internal/syncdrive/sync_task.go
@@ -0,0 +1,257 @@
+package syncdrive
+
+import (
+	"context"
+	"fmt"
+	"github.com/tickstep/aliyunpan/internal/utils"
+	"github.com/tickstep/aliyunpan/internal/waitgroup"
+	"github.com/tickstep/aliyunpan/library/collection"
+	"github.com/tickstep/library-go/logger"
+	"io/ioutil"
+	"os"
+	"path"
+	"strings"
+	"time"
+)
+
+type (
+	SyncMode string
+
+	// SyncTask 同步任务
+	SyncTask struct {
+		// Id 任务ID
+		Id string `json:"id"`
+		// DriveId 网盘ID，目前支持文件网盘
+		DriveId string `json:"driveId"`
+		// LocalFolderPath 本地目录
+		LocalFolderPath string `json:"localFolderPath"`
+		// PanFolderPath 云盘目录
+		PanFolderPath string `json:"panFolderPath"`
+		// Mode 同步模式
+		Mode SyncMode `json:"mode"`
+		// LastSyncTime 上一次同步时间
+		LastSyncTime string `json:"lastSyncTime"`
+
+		syncDbFolderPath string
+		localFileDb      LocalSyncDb
+		panFileDb        PanSyncDb
+
+		wg         *waitgroup.WaitGroup
+		ctx        context.Context
+		cancelFunc context.CancelFunc
+	}
+
+	// SyncTaskManager 同步任务管理器
+	SyncTaskManager struct {
+		SyncTaskList []*SyncTask
+	}
+)
+
+const (
+	// UploadOnly 单向上传
+	UploadOnly SyncMode = "upload"
+	// DownloadOnly 只下载
+	DownloadOnly SyncMode = "download"
+	// SyncTwoWay 双向同步
+	SyncTwoWay SyncMode = "sync"
+)
+
+// Start 启动同步任务
+func (t *SyncTask) Start() error {
+	if t.ctx != nil {
+		return fmt.Errorf("task have starting")
+	}
+	t.localFileDb = NewLocalSyncDb(t.localSyncDbFullPath())
+	t.panFileDb = newPanSyncDbBolt(t.panSyncDbFullPath())
+	if _, e := t.localFileDb.Open(); e != nil {
+		return e
+	}
+	if _, e := t.panFileDb.Open(); e != nil {
+		return e
+	}
+
+	t.wg = waitgroup.NewWaitGroup(2)
+
+	var cancel context.CancelFunc
+	t.ctx, cancel = context.WithCancel(context.Background())
+	t.cancelFunc = cancel
+
+	go t.scanLocalFile(t.ctx)
+	go t.scanPanFile(t.ctx)
+	return nil
+}
+
+// Stop 停止同步任务
+func (t *SyncTask) Stop() error {
+	if t.ctx == nil {
+		return nil
+	}
+	// cancel all sub task & process
+	t.cancelFunc()
+
+	// wait for finished
+	t.wg.Wait()
+
+	t.ctx = nil
+	t.cancelFunc = nil
+
+	// release resources
+	if t.localFileDb != nil {
+		t.localFileDb.Close()
+	}
+	if t.panFileDb != nil {
+		t.panFileDb.Close()
+	}
+	return nil
+}
+
+// panSyncDbFullPath 云盘文件数据库
+func (t *SyncTask) panSyncDbFullPath() string {
+	dir := path.Join(t.syncDbFolderPath, t.Id)
+	if b, _ := utils.PathExists(dir); !b {
+		os.MkdirAll(dir, 0600)
+	}
+	return path.Join(dir, "pan.bolt")
+}
+
+// localSyncDbFullPath 本地文件数据库
+func (t *SyncTask) localSyncDbFullPath() string {
+	dir := path.Join(t.syncDbFolderPath, t.Id)
+	if b, _ := utils.PathExists(dir); !b {
+		os.MkdirAll(dir, 0600)
+	}
+	return path.Join(dir, "local.bolt")
+}
+
+func newLocalFileItem(file os.FileInfo, fullPath string) *LocalFileItem {
+	ft := "file"
+	if file.IsDir() {
+		ft = "folder"
+	}
+	return &LocalFileItem{
+		FileName:      file.Name(),
+		FileSize:      file.Size(),
+		FileType:      ft,
+		CreatedAt:     file.ModTime().Format("2006-01-02 15:04:05"),
+		UpdatedAt:     file.ModTime().Format("2006-01-02 15:04:05"),
+		FileExtension: path.Ext(file.Name()),
+		Sha1Hash:      "",
+		Path:          fullPath,
+	}
+}
+
+// scanLocalFile 本地文件循环扫描进程
+func (t *SyncTask) scanLocalFile(ctx context.Context) {
+	type folderItem struct {
+		fileInfo os.FileInfo
+		path     string
+	}
+
+	// init the root folders info
+	pathParts := strings.Split(strings.ReplaceAll(t.LocalFolderPath, "\\", "/"), "/")
+	fullPath := ""
+	for _, p := range pathParts {
+		if p == "" {
+			continue
+		}
+		if strings.Contains(p, ":") {
+			// windows volume label, e.g: C:/ D:/
+			fullPath += p
+			continue
+		}
+		fullPath += "/" + p
+		fi, err := os.Stat(fullPath)
+		if err != nil {
+			// may be permission deny
+			continue
+		}
+		t.localFileDb.Add(newLocalFileItem(fi, fullPath))
+	}
+
+	folderQueue := collection.NewFifoQueue()
+	rootFolder, err := os.Stat(t.LocalFolderPath)
+	if err != nil {
+		return
+	}
+	folderQueue.Push(folderItem{
+		fileInfo: rootFolder,
+		path:     t.LocalFolderPath,
+	})
+	t.wg.AddDelta()
+	defer t.wg.Done()
+	for {
+		select {
+		case <-ctx.Done():
+			// cancel routine & done
+			logger.Verboseln("local file routine done")
+			return
+		default:
+			// 采用广度优先遍历(BFS)进行文件遍历
+			logger.Verboseln("do scan local file process")
+			obj := folderQueue.Pop()
+			if obj == nil {
+				return
+			}
+			item := obj.(folderItem)
+			// TODO: check to run scan process or to wait
+
+			files, err := ioutil.ReadDir(item.path)
+			if err != nil {
+				continue
+			}
+			if len(files) == 0 {
+				continue
+			}
+			localFileAppendList := LocalFileList{}
+			for _, file := range files {
+				localFile := newLocalFileItem(file, item.path+"/"+file.Name())
+				localFileInDb, _ := t.localFileDb.Get(localFile.Path)
+				if localFileInDb == nil {
+					// append
+					localFileAppendList = append(localFileAppendList, localFile)
+				} else {
+					// update newest info into DB
+					localFileInDb.UpdatedAt = localFile.UpdatedAt
+					localFileInDb.CreatedAt = localFile.CreatedAt
+					localFileInDb.FileSize = localFile.FileSize
+					localFileInDb.FileType = localFile.FileType
+					t.localFileDb.Update(localFileInDb)
+				}
+
+				// for next term scan
+				if file.IsDir() {
+					folderQueue.Push(folderItem{
+						fileInfo: file,
+						path:     item.path + "/" + file.Name(),
+					})
+				}
+			}
+
+			if len(localFileAppendList) > 0 {
+				//fmt.Println(utils.ObjectToJsonStr(localFileAppendList))
+				if _, er := t.localFileDb.AddFileList(localFileAppendList); er != nil {
+					logger.Verboseln("add files to local file db error {}", er)
+				}
+			}
+			time.Sleep(500 * time.Millisecond)
+		}
+	}
+}
+
+// scanPanFile 云盘文件循环扫描进程
+func (t *SyncTask) scanPanFile(ctx context.Context) {
+	t.wg.AddDelta()
+	defer t.wg.Done()
+	for {
+		select {
+		case <-ctx.Done():
+			// cancel routine & done
+			logger.Verboseln("pan file routine done")
+			return
+		default:
+			// 采用广度优先遍历(BFS)进行文件遍历
+			logger.Verboseln("do scan pan file process")
+			time.Sleep(1 * time.Second)
+		}
+	}
+}
diff --git a/internal/syncdrive/sync_task_test.go b/internal/syncdrive/sync_task_test.go
new file mode 100644
index 0000000..baa8730
--- /dev/null
+++ b/internal/syncdrive/sync_task_test.go
@@ -0,0 +1,26 @@
+package syncdrive
+
+import (
+	"testing"
+	"time"
+)
+
+func TestSyncTask(t *testing.T) {
+	task := SyncTask{
+		Id:              "840f28af799747848c0b3155e0bdfeab",
+		DriveId:         "",
+		LocalFolderPath: "/Volumes/Downloads/dev/upload",
+		PanFolderPath:   "/sync_drive",
+		Mode:            "sync",
+		LastSyncTime:    "",
+
+		syncDbFolderPath: "/Volumes/Downloads/dev/sync_drive",
+	}
+	task.Start()
+	//go func() {
+	//	time.Sleep(10 * time.Second)
+	//	task.Stop()
+	//}()
+	time.Sleep(10 * time.Second)
+	task.Stop()
+}
diff --git a/internal/utils/utils.go b/internal/utils/utils.go
index 85857e3..44f176d 100644
--- a/internal/utils/utils.go
+++ b/internal/utils/utils.go
@@ -17,11 +17,13 @@ import (
 	"compress/gzip"
 	"flag"
 	"fmt"
+	jsoniter "github.com/json-iterator/go"
 	"github.com/tickstep/library-go/ids"
 	"io"
 	"io/ioutil"
 	"net/http/cookiejar"
 	"net/url"
+	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -161,3 +163,21 @@ func GetUniqueKeyStr() string {
 	}
 	return keyStr
 }
+
+// PathExists 文件路径是否存在
+func PathExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, err
+}
+
+// ObjectToJsonStr 转换成json字符串
+func ObjectToJsonStr(v interface{}) string {
+	r, _ := jsoniter.MarshalToString(v)
+	return string(r)
+}
diff --git a/library/collection/queue.go b/library/collection/queue.go
new file mode 100644
index 0000000..56cdaaf
--- /dev/null
+++ b/library/collection/queue.go
@@ -0,0 +1,42 @@
+package collection
+
+import "sync"
+
+type Queue struct {
+	queueList []interface{}
+
+	mutex sync.Mutex
+}
+
+func NewFifoQueue() *Queue {
+	return &Queue{}
+}
+
+func (q *Queue) Push(item interface{}) {
+	q.mutex.Lock()
+	defer q.mutex.Unlock()
+	if q.queueList == nil {
+		q.queueList = []interface{}{}
+	}
+	q.queueList = append(q.queueList, item)
+}
+
+func (q *Queue) Pop() interface{} {
+	q.mutex.Lock()
+	defer q.mutex.Unlock()
+	if q.queueList == nil {
+		q.queueList = []interface{}{}
+	}
+	if len(q.queueList) == 0 {
+		return nil
+	}
+	item := q.queueList[0]
+	q.queueList = q.queueList[1:]
+	return item
+}
+
+func (q *Queue) Length() int {
+	q.mutex.Lock()
+	defer q.mutex.Unlock()
+	return len(q.queueList)
+}