diff --git a/pkg/monitor/notifydrivers/feishu/cache.go b/pkg/monitor/notifydrivers/feishu/cache.go
new file mode 100644
index 0000000000..f3fc13e17d
--- /dev/null
+++ b/pkg/monitor/notifydrivers/feishu/cache.go
@@ -0,0 +1,68 @@
+// Copyright 2019 Yunion
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package feishu
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"time"
+)
+
+type IExpirable interface {
+	CreatedAt() int64
+	ExpiresIn() int64
+}
+
+type ICache interface {
+	Set(data IExpirable) error
+	Get(data IExpirable) error
+}
+
+type FileCache struct {
+	Path string
+}
+
+func NewFileCache(path string) *FileCache {
+	return &FileCache{
+		Path: path,
+	}
+}
+
+func (c *FileCache) Set(data IExpirable) error {
+	bytes, err := json.Marshal(data)
+	if err == nil {
+		ioutil.WriteFile(c.Path, bytes, 0644)
+	}
+	return err
+}
+
+func (c *FileCache) Get(data IExpirable) error {
+	bytes, err := ioutil.ReadFile(c.Path)
+	if err != nil {
+		return err
+	}
+	err = json.Unmarshal(bytes, data)
+	if err != nil {
+		return err
+	}
+	created := data.CreatedAt()
+	expires := data.ExpiresIn()
+	// The operator '-120' can give us a head start on the expiration date
+	if time.Now().Unix() > created+expires-120 {
+		err = fmt.Errorf("Data is already expired")
+	}
+	return err
+}
diff --git a/pkg/monitor/notifydrivers/feishu/cache_test.go b/pkg/monitor/notifydrivers/feishu/cache_test.go
new file mode 100644
index 0000000000..c8c524123c
--- /dev/null
+++ b/pkg/monitor/notifydrivers/feishu/cache_test.go
@@ -0,0 +1,65 @@
+// Copyright 2019 Yunion
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package feishu
+
+import (
+	"os"
+	"testing"
+	"time"
+)
+
+func TestFileCache(t *testing.T) {
+	token := "atokeexamplenomeaning"
+	cache := NewFileCache(".test_auth_file")
+	defer func() {
+		os.Remove(".test_auth_file")
+	}()
+	t.Run("unexpired", func(t *testing.T) {
+		tokenIn := TenantAccesstoken{
+			TenantAccessToken: token,
+			Expire:            3600,
+			Created:           time.Now().Unix(),
+		}
+		err := cache.Set(tokenIn)
+		if err != nil {
+			t.Fatalf("cache set error: %s", err)
+		}
+		var tokenOut TenantAccesstoken
+		err = cache.Get(&tokenOut)
+		if err != nil {
+			t.Fatalf("cache get error: %s", err)
+		}
+		if tokenIn.TenantAccessToken != tokenOut.TenantAccessToken {
+			t.Fatalf("the token value stored in cache is incorrect")
+		}
+	})
+
+	t.Run("expired", func(t *testing.T) {
+		tokenIn := TenantAccesstoken{
+			TenantAccessToken: token,
+			Expire:            119,
+			Created:           time.Now().Unix(),
+		}
+		err := cache.Set(tokenIn)
+		if err != nil {
+			t.Fatalf("cache set error: %s", err)
+		}
+		var tokenOut TenantAccesstoken
+		err = cache.Get(&tokenOut)
+		if err == nil {
+			t.Fatalf("Getting expired token from cache should produce an error")
+		}
+	})
+}
diff --git a/pkg/monitor/notifydrivers/feishu/client.go b/pkg/monitor/notifydrivers/feishu/client.go
index 12d29edc83..c57a94b171 100644
--- a/pkg/monitor/notifydrivers/feishu/client.go
+++ b/pkg/monitor/notifydrivers/feishu/client.go
@@ -18,6 +18,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"time"
 
 	"yunion.io/x/jsonutils"
 	"yunion.io/x/pkg/errors"
@@ -32,6 +33,8 @@ const (
 	ApiChatList = "https://open.feishu.cn/open-apis/chat/v4/list"
 	// 机器人发送消息
 	ApiRobotSendMessage = "https://open.feishu.cn/open-apis/message/v4/send/"
+	// 使用手机号或邮箱获取用户ID
+	ApiFetchUserID = "https://open.feishu.cn/open-apis/user/v1/batch_get_id"
 )
 
 var (
@@ -75,7 +78,10 @@ func GetTenantAccessTokenInternal(appId string, appSecret string) (*TenantAccess
 }
 
 type Tenant struct {
+	AppId       string
+	AppSecret   string
 	AccessToken string
+	Cache       ICache
 }
 
 func BuildTokenHeader(token string) http.Header {
@@ -85,13 +91,34 @@ func BuildTokenHeader(token string) http.Header {
 }
 
 func NewTenant(appId, appSecret string) (*Tenant, error) {
-	resp, err := GetTenantAccessTokenInternal(appId, appSecret)
-	if err != nil {
-		return nil, err
+	t := &Tenant{
+		AppId:       appId,
+		AppSecret:   appSecret,
+		AccessToken: "",
+		Cache:       nil,
 	}
-	return &Tenant{
-		AccessToken: resp.TenantAccessToken,
-	}, nil
+	t.Cache = NewFileCache(fmt.Sprintf(".%s_auth_file", appId))
+	err := t.RefreshAccessToken()
+	return t, err
+}
+
+// RefreshAccessToken is to get a valid access token
+func (t *Tenant) RefreshAccessToken() error {
+	var data TenantAccesstoken
+	err := t.Cache.Get(&data)
+	if err == nil {
+		t.AccessToken = data.TenantAccessToken
+		return nil
+	}
+
+	tokenResp, err := GetTenantAccessTokenInternal(t.AppId, t.AppSecret)
+	if err == nil {
+		t.AccessToken = tokenResp.TenantAccessToken
+		data = tokenResp.TenantAccesstoken
+		data.Created = time.Now().Unix()
+		err = t.Cache.Set(&data)
+	}
+	return err
 }
 
 func (t *Tenant) request(method httputils.THttpMethod, url string, data jsonutils.JSONObject, out CommonResponser) error {
@@ -104,7 +131,13 @@ func (t *Tenant) request(method httputils.THttpMethod, url string, data jsonutil
 }
 
 func (t *Tenant) get(url string, query jsonutils.JSONObject, out CommonResponser) error {
-	return t.request(httputils.GET, url, query, out)
+	if query != nil {
+		qs := query.QueryString()
+		if len(qs) > 0 {
+			url = fmt.Sprintf("%s?%s", url, qs)
+		}
+	}
+	return t.request(httputils.GET, url, nil, out)
 }
 
 func (t *Tenant) post(url string, body jsonutils.JSONObject, out CommonResponser) error {
@@ -130,3 +163,23 @@ func (t *Tenant) SendMessage(msg MsgReq) (*MsgResp, error) {
 	err := t.post(ApiRobotSendMessage, body, resp)
 	return resp, err
 }
+
+// UserIdByMobile query the open id of user by mobile number. https://open.feishu.cn/document/ukTMukTMukTM/uUzMyUjL1MjM14SNzITN
+func (t *Tenant) UserIdByMobile(mobile string) (string, error) {
+	query := jsonutils.NewDict()
+	query.Set("mobiles", jsonutils.NewString(mobile))
+	resp := new(UserIDResp)
+	err := t.get(ApiFetchUserID, query, resp)
+	if err != nil {
+		return "", err
+	}
+	if len(resp.Data.MobilesNotExist) != 0 {
+		return "", errors.Wrapf(errors.ErrNotFound, "no such user whose mobile is %s", mobile)
+	}
+	list, err := resp.Data.MobileUsers.GetArray(mobile)
+	if err != nil {
+		return "", errors.Wrap(err, "jsonutils.JSONObject.GetArray")
+	}
+	// len(list) must be positive
+	return list[0].GetString("open_id")
+}
diff --git a/pkg/monitor/notifydrivers/feishu/types.go b/pkg/monitor/notifydrivers/feishu/types.go
index d2fa517ab9..8b27828896 100644
--- a/pkg/monitor/notifydrivers/feishu/types.go
+++ b/pkg/monitor/notifydrivers/feishu/types.go
@@ -14,6 +14,8 @@
 
 package feishu
 
+import "yunion.io/x/jsonutils"
+
 type CommonResp struct {
 	Code int    `json:"code"`
 	Msg  string `json:"msg"`
@@ -34,8 +36,21 @@ type CommonResponser interface {
 
 type TenantAccesstokenResp struct {
 	CommonResp
+	TenantAccesstoken
+}
+
+type TenantAccesstoken struct {
 	TenantAccessToken string `json:"tenant_access_token"`
 	Expire            int64  `json:"expire"`
+	Created           int64
+}
+
+func (t TenantAccesstoken) CreatedAt() int64 {
+	return t.Created
+}
+
+func (t TenantAccesstoken) ExpiresIn() int64 {
+	return t.Expire
 }
 
 type GroupListResp struct {
@@ -224,3 +239,16 @@ type MsgResp struct {
 type MsgRespData struct {
 	MessageId string `json:"message_id"`
 }
+
+type UserIDResp struct {
+	CommonResp
+
+	Data UserIDRespData `json:"data"`
+}
+
+type UserIDRespData struct {
+	EmailUsers      jsonutils.JSONObject `json:"email_users"`
+	EmailsNotExist  []string             `json:"emails_not_exist"`
+	MobileUsers     jsonutils.JSONObject `json:"mobile_users"`
+	MobilesNotExist []string             `json:"mobiles_not_exist"`
+}