diff --git a/models/issue.go b/models/issue.go
index 525152552c..688a412d8c 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -428,52 +428,6 @@ func (issue *Issue) HasLabel(labelID int64) bool {
 	return issue.hasLabel(x, labelID)
 }
 
-func (issue *Issue) sendLabelUpdatedWebhook(doer *User) {
-	var err error
-
-	if err = issue.loadRepo(x); err != nil {
-		log.Error("loadRepo: %v", err)
-		return
-	}
-
-	if err = issue.loadPoster(x); err != nil {
-		log.Error("loadPoster: %v", err)
-		return
-	}
-
-	mode, _ := AccessLevel(issue.Poster, issue.Repo)
-	if issue.IsPull {
-		if err = issue.loadPullRequest(x); err != nil {
-			log.Error("loadPullRequest: %v", err)
-			return
-		}
-		if err = issue.PullRequest.LoadIssue(); err != nil {
-			log.Error("LoadIssue: %v", err)
-			return
-		}
-		err = PrepareWebhooks(issue.Repo, HookEventPullRequest, &api.PullRequestPayload{
-			Action:      api.HookIssueLabelUpdated,
-			Index:       issue.Index,
-			PullRequest: issue.PullRequest.APIFormat(),
-			Repository:  issue.Repo.APIFormat(AccessModeNone),
-			Sender:      doer.APIFormat(),
-		})
-	} else {
-		err = PrepareWebhooks(issue.Repo, HookEventIssues, &api.IssuePayload{
-			Action:     api.HookIssueLabelUpdated,
-			Index:      issue.Index,
-			Issue:      issue.APIFormat(),
-			Repository: issue.Repo.APIFormat(mode),
-			Sender:     doer.APIFormat(),
-		})
-	}
-	if err != nil {
-		log.Error("PrepareWebhooks [is_pull: %v]: %v", issue.IsPull, err)
-	} else {
-		go HookQueue.Add(issue.RepoID)
-	}
-}
-
 // ReplyReference returns tokenized address to use for email reply headers
 func (issue *Issue) ReplyReference() string {
 	var path string
@@ -490,30 +444,10 @@ func (issue *Issue) addLabel(e *xorm.Session, label *Label, doer *User) error {
 	return newIssueLabel(e, issue, label, doer)
 }
 
-// AddLabel adds a new label to the issue.
-func (issue *Issue) AddLabel(doer *User, label *Label) error {
-	if err := NewIssueLabel(issue, label, doer); err != nil {
-		return err
-	}
-
-	issue.sendLabelUpdatedWebhook(doer)
-	return nil
-}
-
 func (issue *Issue) addLabels(e *xorm.Session, labels []*Label, doer *User) error {
 	return newIssueLabels(e, issue, labels, doer)
 }
 
-// AddLabels adds a list of new labels to the issue.
-func (issue *Issue) AddLabels(doer *User, labels []*Label) error {
-	if err := NewIssueLabels(issue, labels, doer); err != nil {
-		return err
-	}
-
-	issue.sendLabelUpdatedWebhook(doer)
-	return nil
-}
-
 func (issue *Issue) getLabels(e Engine) (err error) {
 	if len(issue.Labels) > 0 {
 		return nil
@@ -530,28 +464,6 @@ func (issue *Issue) removeLabel(e *xorm.Session, doer *User, label *Label) error
 	return deleteIssueLabel(e, issue, label, doer)
 }
 
-// RemoveLabel removes a label from issue by given ID.
-func (issue *Issue) RemoveLabel(doer *User, label *Label) error {
-	if err := issue.loadRepo(x); err != nil {
-		return err
-	}
-
-	perm, err := GetUserRepoPermission(issue.Repo, doer)
-	if err != nil {
-		return err
-	}
-	if !perm.CanWriteIssuesOrPulls(issue.IsPull) {
-		return ErrLabelNotExist{}
-	}
-
-	if err := DeleteIssueLabel(issue, label, doer); err != nil {
-		return err
-	}
-
-	issue.sendLabelUpdatedWebhook(doer)
-	return nil
-}
-
 func (issue *Issue) clearLabels(e *xorm.Session, doer *User) (err error) {
 	if err = issue.getLabels(e); err != nil {
 		return fmt.Errorf("getLabels: %v", err)
diff --git a/models/issue_test.go b/models/issue_test.go
index 0be3f68808..7614c2f554 100644
--- a/models/issue_test.go
+++ b/models/issue_test.go
@@ -84,53 +84,6 @@ func TestGetParticipantsByIssueID(t *testing.T) {
 	checkParticipants(1, []int{5})
 }
 
-func TestIssue_AddLabel(t *testing.T) {
-	var tests = []struct {
-		issueID int64
-		labelID int64
-		doerID  int64
-	}{
-		{1, 2, 2}, // non-pull-request, not-already-added label
-		{1, 1, 2}, // non-pull-request, already-added label
-		{2, 2, 2}, // pull-request, not-already-added label
-		{2, 1, 2}, // pull-request, already-added label
-	}
-	for _, test := range tests {
-		assert.NoError(t, PrepareTestDatabase())
-		issue := AssertExistsAndLoadBean(t, &Issue{ID: test.issueID}).(*Issue)
-		label := AssertExistsAndLoadBean(t, &Label{ID: test.labelID}).(*Label)
-		doer := AssertExistsAndLoadBean(t, &User{ID: test.doerID}).(*User)
-		assert.NoError(t, issue.AddLabel(doer, label))
-		AssertExistsAndLoadBean(t, &IssueLabel{IssueID: test.issueID, LabelID: test.labelID})
-	}
-}
-
-func TestIssue_AddLabels(t *testing.T) {
-	var tests = []struct {
-		issueID  int64
-		labelIDs []int64
-		doerID   int64
-	}{
-		{1, []int64{1, 2}, 2}, // non-pull-request
-		{1, []int64{}, 2},     // non-pull-request, empty
-		{2, []int64{1, 2}, 2}, // pull-request
-		{2, []int64{}, 1},     // pull-request, empty
-	}
-	for _, test := range tests {
-		assert.NoError(t, PrepareTestDatabase())
-		issue := AssertExistsAndLoadBean(t, &Issue{ID: test.issueID}).(*Issue)
-		labels := make([]*Label, len(test.labelIDs))
-		for i, labelID := range test.labelIDs {
-			labels[i] = AssertExistsAndLoadBean(t, &Label{ID: labelID}).(*Label)
-		}
-		doer := AssertExistsAndLoadBean(t, &User{ID: test.doerID}).(*User)
-		assert.NoError(t, issue.AddLabels(doer, labels))
-		for _, labelID := range test.labelIDs {
-			AssertExistsAndLoadBean(t, &IssueLabel{IssueID: test.issueID, LabelID: labelID})
-		}
-	}
-}
-
 func TestIssue_ClearLabels(t *testing.T) {
 	var tests = []struct {
 		issueID int64
diff --git a/routers/api/v1/repo/issue_label.go b/routers/api/v1/repo/issue_label.go
index 7bd76c24c2..e41c1512e2 100644
--- a/routers/api/v1/repo/issue_label.go
+++ b/routers/api/v1/repo/issue_label.go
@@ -117,7 +117,7 @@ func AddIssueLabels(ctx *context.APIContext, form api.IssueLabelsOption) {
 		return
 	}
 
-	if err = issue.AddLabels(ctx.User, labels); err != nil {
+	if err = issue_service.AddLabels(issue, ctx.User, labels); err != nil {
 		ctx.Error(500, "AddLabels", err)
 		return
 	}
diff --git a/routers/repo/issue_label.go b/routers/repo/issue_label.go
index 53c37e2e97..02568f77a6 100644
--- a/routers/repo/issue_label.go
+++ b/routers/repo/issue_label.go
@@ -162,14 +162,14 @@ func UpdateIssueLabel(ctx *context.Context) {
 
 		if action == "attach" {
 			for _, issue := range issues {
-				if err = issue.AddLabel(ctx.User, label); err != nil {
+				if err = issue_service.AddLabel(issue, ctx.User, label); err != nil {
 					ctx.ServerError("AddLabel", err)
 					return
 				}
 			}
 		} else {
 			for _, issue := range issues {
-				if err = issue.RemoveLabel(ctx.User, label); err != nil {
+				if err = issue_service.RemoveLabel(issue, ctx.User, label); err != nil {
 					ctx.ServerError("RemoveLabel", err)
 					return
 				}
diff --git a/services/issue/label.go b/services/issue/label.go
index 4af8c2b97e..b393e5d38c 100644
--- a/services/issue/label.go
+++ b/services/issue/label.go
@@ -6,9 +6,57 @@ package issue
 
 import (
 	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/notification"
+	api "code.gitea.io/gitea/modules/structs"
 )
 
+func sendLabelUpdatedWebhook(issue *models.Issue, doer *models.User) {
+	var err error
+
+	if err = issue.LoadRepo(); err != nil {
+		log.Error("LoadRepo: %v", err)
+		return
+	}
+
+	if err = issue.LoadPoster(); err != nil {
+		log.Error("LoadPoster: %v", err)
+		return
+	}
+
+	mode, _ := models.AccessLevel(issue.Poster, issue.Repo)
+	if issue.IsPull {
+		if err = issue.LoadPullRequest(); err != nil {
+			log.Error("loadPullRequest: %v", err)
+			return
+		}
+		if err = issue.PullRequest.LoadIssue(); err != nil {
+			log.Error("LoadIssue: %v", err)
+			return
+		}
+		err = models.PrepareWebhooks(issue.Repo, models.HookEventPullRequest, &api.PullRequestPayload{
+			Action:      api.HookIssueLabelUpdated,
+			Index:       issue.Index,
+			PullRequest: issue.PullRequest.APIFormat(),
+			Repository:  issue.Repo.APIFormat(models.AccessModeNone),
+			Sender:      doer.APIFormat(),
+		})
+	} else {
+		err = models.PrepareWebhooks(issue.Repo, models.HookEventIssues, &api.IssuePayload{
+			Action:     api.HookIssueLabelUpdated,
+			Index:      issue.Index,
+			Issue:      issue.APIFormat(),
+			Repository: issue.Repo.APIFormat(mode),
+			Sender:     doer.APIFormat(),
+		})
+	}
+	if err != nil {
+		log.Error("PrepareWebhooks [is_pull: %v]: %v", issue.IsPull, err)
+	} else {
+		go models.HookQueue.Add(issue.RepoID)
+	}
+}
+
 // ClearLabels clears all of an issue's labels
 func ClearLabels(issue *models.Issue, doer *models.User) (err error) {
 	if err = issue.ClearLabels(doer); err != nil {
@@ -19,3 +67,45 @@ func ClearLabels(issue *models.Issue, doer *models.User) (err error) {
 
 	return nil
 }
+
+// AddLabel adds a new label to the issue.
+func AddLabel(issue *models.Issue, doer *models.User, label *models.Label) error {
+	if err := models.NewIssueLabel(issue, label, doer); err != nil {
+		return err
+	}
+
+	sendLabelUpdatedWebhook(issue, doer)
+	return nil
+}
+
+// AddLabels adds a list of new labels to the issue.
+func AddLabels(issue *models.Issue, doer *models.User, labels []*models.Label) error {
+	if err := models.NewIssueLabels(issue, labels, doer); err != nil {
+		return err
+	}
+
+	sendLabelUpdatedWebhook(issue, doer)
+	return nil
+}
+
+// RemoveLabel removes a label from issue by given ID.
+func RemoveLabel(issue *models.Issue, doer *models.User, label *models.Label) error {
+	if err := issue.LoadRepo(); err != nil {
+		return err
+	}
+
+	perm, err := models.GetUserRepoPermission(issue.Repo, doer)
+	if err != nil {
+		return err
+	}
+	if !perm.CanWriteIssuesOrPulls(issue.IsPull) {
+		return models.ErrLabelNotExist{}
+	}
+
+	if err := models.DeleteIssueLabel(issue, label, doer); err != nil {
+		return err
+	}
+
+	sendLabelUpdatedWebhook(issue, doer)
+	return nil
+}
diff --git a/services/issue/label_test.go b/services/issue/label_test.go
new file mode 100644
index 0000000000..0652028943
--- /dev/null
+++ b/services/issue/label_test.go
@@ -0,0 +1,59 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package issue
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIssue_AddLabels(t *testing.T) {
+	var tests = []struct {
+		issueID  int64
+		labelIDs []int64
+		doerID   int64
+	}{
+		{1, []int64{1, 2}, 2}, // non-pull-request
+		{1, []int64{}, 2},     // non-pull-request, empty
+		{2, []int64{1, 2}, 2}, // pull-request
+		{2, []int64{}, 1},     // pull-request, empty
+	}
+	for _, test := range tests {
+		assert.NoError(t, models.PrepareTestDatabase())
+		issue := models.AssertExistsAndLoadBean(t, &models.Issue{ID: test.issueID}).(*models.Issue)
+		labels := make([]*models.Label, len(test.labelIDs))
+		for i, labelID := range test.labelIDs {
+			labels[i] = models.AssertExistsAndLoadBean(t, &models.Label{ID: labelID}).(*models.Label)
+		}
+		doer := models.AssertExistsAndLoadBean(t, &models.User{ID: test.doerID}).(*models.User)
+		assert.NoError(t, AddLabels(issue, doer, labels))
+		for _, labelID := range test.labelIDs {
+			models.AssertExistsAndLoadBean(t, &models.IssueLabel{IssueID: test.issueID, LabelID: labelID})
+		}
+	}
+}
+
+func TestIssue_AddLabel(t *testing.T) {
+	var tests = []struct {
+		issueID int64
+		labelID int64
+		doerID  int64
+	}{
+		{1, 2, 2}, // non-pull-request, not-already-added label
+		{1, 1, 2}, // non-pull-request, already-added label
+		{2, 2, 2}, // pull-request, not-already-added label
+		{2, 1, 2}, // pull-request, already-added label
+	}
+	for _, test := range tests {
+		assert.NoError(t, models.PrepareTestDatabase())
+		issue := models.AssertExistsAndLoadBean(t, &models.Issue{ID: test.issueID}).(*models.Issue)
+		label := models.AssertExistsAndLoadBean(t, &models.Label{ID: test.labelID}).(*models.Label)
+		doer := models.AssertExistsAndLoadBean(t, &models.User{ID: test.doerID}).(*models.User)
+		assert.NoError(t, AddLabel(issue, doer, label))
+		models.AssertExistsAndLoadBean(t, &models.IssueLabel{IssueID: test.issueID, LabelID: test.labelID})
+	}
+}
diff --git a/services/issue/main_test.go b/services/issue/main_test.go
new file mode 100644
index 0000000000..b056678a42
--- /dev/null
+++ b/services/issue/main_test.go
@@ -0,0 +1,16 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package issue
+
+import (
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/models"
+)
+
+func TestMain(m *testing.M) {
+	models.MainTest(m, filepath.Join("..", ".."))
+}