diff --git a/integrations/api_pull_test.go b/integrations/api_pull_test.go
index 9e22be5755b9..61daf917ff27 100644
--- a/integrations/api_pull_test.go
+++ b/integrations/api_pull_test.go
@@ -58,7 +58,7 @@ func TestAPIMergePullWIP(t *testing.T) {
 	session.MakeRequest(t, req, http.StatusMethodNotAllowed)
 }
 
-func TestAPICreatePullSuccess1(t *testing.T) {
+func TestAPICreatePullSuccess(t *testing.T) {
 	defer prepareTestEnv(t)()
 	repo10 := models.AssertExistsAndLoadBean(t, &models.Repository{ID: 10}).(*models.Repository)
 	// repo10 have code, pulls units.
@@ -78,7 +78,7 @@ func TestAPICreatePullSuccess1(t *testing.T) {
 	session.MakeRequest(t, req, 201)
 }
 
-func TestAPICreatePullSuccess2(t *testing.T) {
+func TestAPIEditPull(t *testing.T) {
 	defer prepareTestEnv(t)()
 	repo10 := models.AssertExistsAndLoadBean(t, &models.Repository{ID: 10}).(*models.Repository)
 	owner10 := models.AssertExistsAndLoadBean(t, &models.User{ID: repo10.OwnerID}).(*models.User)
@@ -90,6 +90,21 @@ func TestAPICreatePullSuccess2(t *testing.T) {
 		Base:  "master",
 		Title: "create a success pr",
 	})
+	pull := new(api.PullRequest)
+	resp := session.MakeRequest(t, req, 201)
+	DecodeJSON(t, resp, pull)
+	assert.EqualValues(t, "master", pull.Base.Name)
 
-	session.MakeRequest(t, req, 201)
+	req = NewRequestWithJSON(t, http.MethodPatch, fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d?token=%s", owner10.Name, repo10.Name, pull.Index, token), &api.EditPullRequestOption{
+		Base:  "feature/1",
+		Title: "edit a this pr",
+	})
+	resp = session.MakeRequest(t, req, 201)
+	DecodeJSON(t, resp, pull)
+	assert.EqualValues(t, "feature/1", pull.Base.Name)
+
+	req = NewRequestWithJSON(t, http.MethodPatch, fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d?token=%s", owner10.Name, repo10.Name, pull.Index, token), &api.EditPullRequestOption{
+		Base: "not-exist",
+	})
+	session.MakeRequest(t, req, 404)
 }
diff --git a/modules/structs/pull.go b/modules/structs/pull.go
index 8dea51f2c680..653091b2f432 100644
--- a/modules/structs/pull.go
+++ b/modules/structs/pull.go
@@ -83,6 +83,7 @@ type CreatePullRequestOption struct {
 type EditPullRequestOption struct {
 	Title     string   `json:"title"`
 	Body      string   `json:"body"`
+	Base      string   `json:"base"`
 	Assignee  string   `json:"assignee"`
 	Assignees []string `json:"assignees"`
 	Milestone int64    `json:"milestone"`
diff --git a/routers/api/v1/repo/pull.go b/routers/api/v1/repo/pull.go
index 284c231628bb..921f61a6128b 100644
--- a/routers/api/v1/repo/pull.go
+++ b/routers/api/v1/repo/pull.go
@@ -464,6 +464,8 @@ func EditPullRequest(ctx *context.APIContext, form api.EditPullRequestOption) {
 	//     "$ref": "#/responses/PullRequest"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+	//   "409":
+	//     "$ref": "#/responses/error"
 	//   "412":
 	//     "$ref": "#/responses/error"
 	//   "422":
@@ -590,6 +592,30 @@ func EditPullRequest(ctx *context.APIContext, form api.EditPullRequestOption) {
 		notification.NotifyIssueChangeStatus(ctx.User, issue, statusChangeComment, issue.IsClosed)
 	}
 
+	// change pull target branch
+	if len(form.Base) != 0 && form.Base != pr.BaseBranch {
+		if !ctx.Repo.GitRepo.IsBranchExist(form.Base) {
+			ctx.Error(http.StatusNotFound, "NewBaseBranchNotExist", fmt.Errorf("new base '%s' not exist", form.Base))
+			return
+		}
+		if err := pull_service.ChangeTargetBranch(pr, ctx.User, form.Base); err != nil {
+			if models.IsErrPullRequestAlreadyExists(err) {
+				ctx.Error(http.StatusConflict, "IsErrPullRequestAlreadyExists", err)
+				return
+			} else if models.IsErrIssueIsClosed(err) {
+				ctx.Error(http.StatusUnprocessableEntity, "IsErrIssueIsClosed", err)
+				return
+			} else if models.IsErrPullRequestHasMerged(err) {
+				ctx.Error(http.StatusConflict, "IsErrPullRequestHasMerged", err)
+				return
+			} else {
+				ctx.InternalServerError(err)
+			}
+			return
+		}
+		notification.NotifyPullRequestChangeTargetBranch(ctx.User, pr, form.Base)
+	}
+
 	// Refetch from database
 	pr, err = models.GetPullRequestByIndex(ctx.Repo.Repository.ID, pr.Index)
 	if err != nil {
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index e91fad693dae..cc802efc95e5 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -6676,6 +6676,9 @@
           "403": {
             "$ref": "#/responses/forbidden"
           },
+          "409": {
+            "$ref": "#/responses/error"
+          },
           "412": {
             "$ref": "#/responses/error"
           },
@@ -12187,6 +12190,10 @@
           },
           "x-go-name": "Assignees"
         },
+        "base": {
+          "type": "string",
+          "x-go-name": "Base"
+        },
         "body": {
           "type": "string",
           "x-go-name": "Body"