diff --git a/engine/load.go b/engine/load.go
index 06d705e1..908c9e5b 100644
--- a/engine/load.go
+++ b/engine/load.go
@@ -17,6 +17,7 @@ import (
 	"github.com/yaoapp/yao/connector"
 	"github.com/yaoapp/yao/flow"
 	"github.com/yaoapp/yao/fs"
+	"github.com/yaoapp/yao/i18n"
 	"github.com/yaoapp/yao/importer"
 	"github.com/yaoapp/yao/model"
 	"github.com/yaoapp/yao/page"
@@ -65,10 +66,18 @@ func Load(cfg config.Config) (err error) {
 		printErr(cfg.Mode, "FileSystem", err)
 	}
 
-	// Load Studio
-	err = studio.Load(cfg)
+	// Load i18n
+	err = i18n.Load(cfg)
 	if err != nil {
-		printErr(cfg.Mode, "Studio", err)
+		printErr(cfg.Mode, "i18n", err)
+	}
+
+	// Load Studio development mode only
+	if cfg.Mode == "development" {
+		err = studio.Load(cfg)
+		if err != nil {
+			printErr(cfg.Mode, "Studio", err)
+		}
 	}
 
 	// 第二步: 建立数据库 & 会话连接
diff --git a/widgets/app/app.go b/widgets/app/app.go
index 4c0eb5f4..a0a6a8c8 100644
--- a/widgets/app/app.go
+++ b/widgets/app/app.go
@@ -6,9 +6,11 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	jsoniter "github.com/json-iterator/go"
 	"github.com/yaoapp/gou"
+	"github.com/yaoapp/gou/session"
 	"github.com/yaoapp/kun/exception"
 	"github.com/yaoapp/yao/config"
 	"github.com/yaoapp/yao/data"
@@ -110,6 +112,19 @@ func exportAPI() error {
 	}
 	http.Paths = append(http.Paths, path)
 
+	// POST
+	path = gou.Path{
+		Label:       "App Setting",
+		Description: "App Setting",
+		Guard:       "-",
+		Path:        "/setting",
+		Method:      "POST",
+		Process:     process,
+		In:          []string{":payload"},
+		Out:         gou.Out{Status: 200, Type: "application/json"},
+	}
+	http.Paths = append(http.Paths, path)
+
 	process = "yao.app.Menu"
 	args := []string{}
 	if Setting.Menu.Process != "" {
@@ -219,11 +234,33 @@ func processSetting(process *gou.Process) interface{} {
 		return nil
 	}
 
+	sid := process.Sid
+	if sid == "" {
+		sid = session.ID()
+	}
+
+	// Set User ENV
+	if process.NumOfArgs() > 0 {
+		payload := process.ArgsMap(0, map[string]interface{}{
+			"now":  time.Now().Unix(),
+			"lang": "en-us",
+			"sid":  "",
+		})
+
+		if payload["sid"] != "" {
+			sid = payload["sid"].(string)
+		}
+
+		lang := fmt.Sprintf("%v", payload["lang"])
+		session.Global().ID(sid).Set("__yao_lang", lang)
+	}
+
 	setting, err := i18n.Trans(process.Lang(), "app", "app", Setting)
 	if err != nil {
 		exception.New(err.Error(), 500).Throw()
 	}
 
+	setting.(*DSL).Sid = sid
 	return *setting.(*DSL)
 }
 
@@ -233,6 +270,27 @@ func processXgen(process *gou.Process) interface{} {
 		exception.New("the app does not init", 500).Throw()
 	}
 
+	sid := process.Sid
+	if sid == "" {
+		sid = session.ID()
+	}
+
+	// Set User ENV
+	if process.NumOfArgs() > 0 {
+		payload := process.ArgsMap(0, map[string]interface{}{
+			"now":  time.Now().Unix(),
+			"lang": "en-us",
+			"sid":  "",
+		})
+
+		if payload["sid"] != "" {
+			sid = payload["sid"].(string)
+		}
+
+		lang := fmt.Sprintf("%v", payload["lang"])
+		session.Global().ID(sid).Set("__yao_lang", lang)
+	}
+
 	mode := os.Getenv("YAO_ENV")
 	if mode == "" {
 		mode = "production"
@@ -324,6 +382,7 @@ func processXgen(process *gou.Process) interface{} {
 		exception.New(err.Error(), 500).Throw()
 	}
 
+	setting.(map[string]interface{})["sid"] = sid
 	return setting.(map[string]interface{})
 }
 
diff --git a/widgets/app/app_test.go b/widgets/app/app_test.go
index eeb787ef..021e670f 100644
--- a/widgets/app/app_test.go
+++ b/widgets/app/app_test.go
@@ -118,7 +118,7 @@ func TestExport(t *testing.T) {
 
 	api, has := gou.APIs["widgets.app"]
 	assert.True(t, has)
-	assert.Equal(t, 3, len(api.HTTP.Paths))
+	assert.Equal(t, 4, len(api.HTTP.Paths))
 
 	_, has = gou.ThirdHandlers["yao.app.setting"]
 	assert.True(t, has)
@@ -146,6 +146,19 @@ func TestProcessSetting(t *testing.T) {
 	assert.Equal(t, "flows.app.menu", setting.Menu.Process)
 	assert.Equal(t, true, setting.Optional.HideNotification)
 	assert.Equal(t, false, setting.Optional.HideSetting)
+	assert.Equal(t, true, setting.Sid != "")
+
+	// Set
+	res, err = gou.NewProcess("yao.app.Setting", map[string]interface{}{"lang": "zh-hk", "sid": setting.Sid}).Exec()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	setting2, ok := res.(DSL)
+	assert.Equal(t, setting.Sid, setting2.Sid)
+
+	lang := gou.NewProcess("yao.app.Setting").WithSID(setting.Sid).Lang()
+	assert.Equal(t, "zh-hk", lang)
 }
 
 func TestProcessXgen(t *testing.T) {
@@ -171,6 +184,20 @@ func TestProcessXgen(t *testing.T) {
 	assert.Equal(t, "Demo Application", xgen.Get("name"))
 	assert.Equal(t, true, xgen.Get("optional.hideNotification"))
 	assert.Equal(t, "localStorage", xgen.Get("token"))
+	assert.Equal(t, true, xgen.Get("sid").(string) != "")
+
+	// Set
+	res, err = gou.NewProcess("yao.app.Xgen", map[string]interface{}{"lang": "zh-hk", "sid": xgen.Get("sid")}).Exec()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	xgen2 := any.Of(res).MapStr().Dot()
+	assert.Equal(t, xgen.Get("sid"), xgen2.Get("sid"))
+
+	lang := gou.NewProcess("yao.app.Setting").WithSID(xgen2.Get("sid").(string)).Lang()
+	assert.Equal(t, "zh-hk", lang)
+
 }
 
 func TestProcessMenu(t *testing.T) {
diff --git a/widgets/app/types.go b/widgets/app/types.go
index ec6adb41..4e4c7832 100644
--- a/widgets/app/types.go
+++ b/widgets/app/types.go
@@ -7,6 +7,8 @@ type DSL struct {
 	Version     string      `json:"version,omitempty"`
 	Description string      `json:"description,omitempty"`
 	Theme       string      `json:"theme,omitempty"`
+	Lang        string      `json:"lang,omitempty"`
+	Sid         string      `json:"sid,omitempty"`
 	Logo        string      `json:"logo,omitempty"`
 	Favicon     string      `json:"favicon,omitempty"`
 	Menu        MenuDSL     `json:"menu,omitempty"`