diff --git a/.gitignore b/.gitignore
index 97d405761fee688b085e6f3966b88a475e5916f2..1e89d74236ad86e345bd5153dc6e19e2ceb80545 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ ci-bot
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+*.bat
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
diff --git a/README.md b/README.md
index 29f0a944e7b12aa09f67e5242ebe0d872571da48..fb811e4616178c716d8f87fc02d5510716d7eb49 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ This is an example to create Database instance.
 The information of database instance will be used in the following Installation.
 
 ## Config
+### environment variables
 Some sensitive configurations items support reading from environment variables.
 you can set the following environment variables in your OS:
 * GITEE_TOKEN 
@@ -30,6 +31,14 @@ you can set the following environment variables in your OS:
 * DATABASE_PORT
 * DATABASE_USERNAME
 * DATABASE_PASSWORD
+### label config
+If you want to clear some tags when the pull request source branch changes,
+ you can configure it in the configuration file(config.yaml).
+ for example see config.yaml delLabels fields.Description:
+ * kind,sig,openeuler-cla,priority Delete labels beginning with kind,sig,openeuler-cla or priority. 
+ * lgtm Delete labels lgtm or beginning with lgtm-.
+ * Except for the above description items, other labels will be judged as equal.
+ 
 
 ## Getting Started
 
diff --git a/config.yaml b/config.yaml
index 74546881f100cbbd22c69c2dd1e4c338ce7e2230..e30216b427fa26d8b00a3a2ce56cae4aca165639 100644
--- a/config.yaml
+++ b/config.yaml
@@ -6,6 +6,16 @@ databasePort: 3306
 databaseName: "cibot"
 databaseUserName: "root"
 databasePassword: "******"
+#the flag that pull request commit_id has changed
+prUpdateLabelFlag: "source_branch_changed"
+#List of labels that need to be deleted after the commit_id is changed
+delLabels:
+  - lgtm
+  - approve
+  - priority
+  - openeuler-cla
+  - sig
+  - kind
 lgtmCountsRequired: 1
 requiringLabels:
 - openeuler-cla/yes
diff --git a/pkg/cibot/config/config.go b/pkg/cibot/config/config.go
index af251f5e0c50f413baeeccb15a5c9a005a3fc7f4..b3f4951896e11d928ba40cd412cab36363890ea9 100644
--- a/pkg/cibot/config/config.go
+++ b/pkg/cibot/config/config.go
@@ -9,6 +9,8 @@ type Config struct {
 	DataBaseName             string             `yaml:"databaseName"`
 	DataBaseUserName         string             `yaml:"databaseUserName" envVariable:"DATABASE_USERNAME"`
 	DataBasePassword         string             `yaml:"databasePassword" envVariable:"DATABASE_PASSWORD"`
+	PrUpdateLabelFlag        string             `yaml:"prUpdateLabelFlag"`
+	DelLabels                []string           `yaml:"delLabels"`
 	WatchProjectFiles        []WatchProjectFile `yaml:"watchProjectFiles"`
 	WatchProjectFileDuration int                `yaml:"watchProjectFileDuration"`
 	WatchSigFiles            []WatchSigFile     `yaml:"watchSigFiles"`
diff --git a/pkg/cibot/label.go b/pkg/cibot/label.go
index 6ffa6062247aa873ffaaf3140ed6ccb40f1af28a..2f4403007f020916d29b01f1086ecef99935e5e9 100644
--- a/pkg/cibot/label.go
+++ b/pkg/cibot/label.go
@@ -36,6 +36,54 @@ func GetLabelsMap(comment string) map[string]string {
 	return mapOfLabels
 }
 
+//GetChangeLabels return the exact list of delete and update labels
+func GetChangeLabels(confDelLabels []string, prLabels []gitee.Label) (delLabels, updateLabels []string) {
+	for _, pl := range prLabels {
+		isUpdate := true
+		for _, cdl := range confDelLabels {
+			//handle lgtm label
+			if cdl == LabelNameLgtm {
+				if strings.HasPrefix(pl.Name, fmt.Sprintf(LabelLgtmWithCommenter, "")) || pl.Name == LabelNameLgtm {
+					delLabels = append(delLabels, pl.Name)
+					isUpdate = false
+				}
+				continue
+			}
+			if cdl == "openeuler-cla" {
+				if strings.HasPrefix(pl.Name,cdl){
+					delLabels = append(delLabels, pl.Name)
+					isUpdate = false
+				}
+				continue
+			}
+			if cdl == "sig"{
+				if strings.HasPrefix(pl.Name,cdl){
+					delLabels = append(delLabels, pl.Name)
+					isUpdate = false
+				}
+				continue
+			}
+			if cdl == "kind"{
+				if strings.HasPrefix(pl.Name,cdl){
+					delLabels = append(delLabels, pl.Name)
+					isUpdate = false
+				}
+				continue
+			}
+            if cdl == pl.Name {
+				delLabels = append(delLabels, pl.Name)
+				isUpdate = false
+				continue
+			}
+
+		}
+		if isUpdate {
+			updateLabels = append(updateLabels, pl.Name)
+		}
+	}
+	return
+}
+
 // GetListOfAddLabels return the exact list of add labels
 func GetListOfAddLabels(mapOfAddLabels map[string]string, listofRepoLabels []gitee.Label, listofItemLabels []gitee.Label) []string {
 	// init
diff --git a/pkg/cibot/pullrequest.go b/pkg/cibot/pullrequest.go
index 5a9c73541e12df7717672fb98ad527568409a13e..47c2040e8cc9534a232e10d5fa9f0e1017f5821e 100644
--- a/pkg/cibot/pullrequest.go
+++ b/pkg/cibot/pullrequest.go
@@ -19,7 +19,7 @@ const (
 )
 
 // HandlePullRequestEvent handles pull request event
-func (s *Server) HandlePullRequestEvent(event *gitee.PullRequestEvent) {
+func (s *Server) HandlePullRequestEvent(actionDesc string, event *gitee.PullRequestEvent) {
 	if event == nil {
 		return
 	}
@@ -98,15 +98,26 @@ func (s *Server) HandlePullRequestEvent(event *gitee.PullRequestEvent) {
 		}
 		listofPrLabels := pr.Labels
 		glog.Infof("List of pr labels: %v", listofPrLabels)
-
+		// remove labels if action_desc is "source_branch_changed"
+		if len(pr.Labels) == 0 || actionDesc != s.Config.PrUpdateLabelFlag {
+			return
+		}
+		delLabels, updateLabels := GetChangeLabels(s.Config.DelLabels, pr.Labels)
+		if len(delLabels) == 0 {
+			return
+		}
+		err = s.UpdateLabelsBySourceBranchChange(delLabels, updateLabels, event)
+		if err != nil {
+			glog.Info(err)
+		}
 		// remove lgtm if changes happen
-		if s.hasLgtmLabel(pr.Labels) {
+		/*if s.hasLgtmLabel(pr.Labels) {
 			err = s.CheckLgtmByPullRequestUpdate(event)
 			if err != nil {
 				glog.Errorf("check lgtm by pull request update. err: %v", err)
 				return
 			}
-		}
+		}*/
 	case "merge":
 		glog.Info("Received a pull request merge event")
 
@@ -136,6 +147,42 @@ func (s *Server) HandlePullRequestEvent(event *gitee.PullRequestEvent) {
 		}
 	}
 }
+
+func (s *Server) UpdateLabelsBySourceBranchChange(delLabels,updateLabels []string,event *gitee.PullRequestEvent) error {
+	owner := event.Repository.Namespace
+	repo := event.Repository.Name
+	prNumber := event.PullRequest.Number
+	strLabel := strings.Join(updateLabels,",")
+	strDelLabel := strings.Join(delLabels,",")
+	body := gitee.PullRequestUpdateParam{}
+	body.AccessToken = s.Config.GiteeToken
+	body.Labels = strLabel
+	glog.Infof("invoke api to remove labels: %v", strLabel)
+	//update pr
+	_, response, err := s.GiteeClient.PullRequestsApi.PatchV5ReposOwnerRepoPullsNumber(s.Context, owner, repo, prNumber, body)
+	if err != nil {
+		if response != nil && response.StatusCode == 400 {
+			glog.Infof("remove labels successfully with status code %d: %v", response.StatusCode, strDelLabel)
+		} else {
+			glog.Errorf("unable to remove labels: %v err: %v", strDelLabel, err)
+			return err
+		}
+	} else {
+		glog.Infof("remove labels successfully: %v", strDelLabel)
+	}
+	// add comment for update labels
+	commentContent := `new changes are detected. ***%s*** is removed in this pull request by: ***%s***. :flushed: `
+	cBody := gitee.PullRequestCommentPostParam{}
+	cBody.AccessToken = s.Config.GiteeToken
+	cBody.Body = fmt.Sprintf(commentContent, strDelLabel,s.Config.BotName)
+	_, _, err = s.GiteeClient.PullRequestsApi.PostV5ReposOwnerRepoPullsNumberComments(s.Context, owner, repo, prNumber, cBody)
+	if err != nil {
+		glog.Errorf("unable to add comment in pull request: %v", err)
+		return err
+	}
+	return nil
+}
+
 func (s *Server) SendNote4AutomaticNewFile(event *gitee.PullRequestEvent) {
 	if event == nil {
 		return
diff --git a/pkg/cibot/server.go b/pkg/cibot/server.go
index 8b4c4b1d16772a6b1437bb56ecbc244aaa99d3f4..de8d006530d9843badb91ee384428e5ad6671dc7 100644
--- a/pkg/cibot/server.go
+++ b/pkg/cibot/server.go
@@ -2,6 +2,7 @@ package cibot
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net/http"
 
@@ -27,7 +28,8 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprint(w, err.Error())
 		return
 	}
-	glog.Infof("payload: %v", string(payload))
+	pstr := string(payload)
+	glog.Infof("payload: %v", pstr)
 
 	// parse into Event
 	messagetype := gitee.WebHookType(r)
@@ -58,7 +60,14 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		go s.HandleIssueEvent(event.(*gitee.IssueEvent))
 	case *gitee.PullRequestEvent:
 		glog.Info("received a pull request event")
-		go s.HandlePullRequestEvent(event.(*gitee.PullRequestEvent))
+		actionDesc:= struct {
+			ActionDesc string `json:"action_desc,omitempty"`
+		}{}
+		err := json.Unmarshal(payload, &actionDesc)
+		if err != nil{
+			glog.Info(err)
+		}
+		go s.HandlePullRequestEvent(actionDesc.ActionDesc,event.(*gitee.PullRequestEvent))
 	case *gitee.TagPushEvent:
 		glog.Info("received a tag push event")
 	}