diff --git a/orm/models_boot.go b/orm/models_boot.go
index 32e143b7b3c6c61efae1eb8382a4a42b34a4bf7e..3274b187db8e227d73b71a97c369499574fd7771 100644
--- a/orm/models_boot.go
+++ b/orm/models_boot.go
@@ -106,9 +106,7 @@ func bootStrap() {
 						msg := fmt.Sprintf("field `%s` wrong rel_through value `%s`", fi.fullName, fi.relThrough)
 						if i := strings.LastIndex(fi.relThrough, "."); i != -1 && len(fi.relThrough) > (i+1) {
 							pn := fi.relThrough[:i]
-							mn := fi.relThrough[i+1:]
-							tn := snakeString(mn)
-							rmi, ok := modelCache.get(tn)
+							rmi, ok := modelCache.getByFN(fi.relThrough)
 							if ok == false || pn != rmi.pkg {
 								err = errors.New(msg + " cannot find table")
 								goto end
diff --git a/orm/models_test.go b/orm/models_test.go
index 8179421e14bbd68d51f7684cb2f1fac634fa0027..18ee0a596af16b7f5e5ed5b643444c3715204cfb 100644
--- a/orm/models_test.go
+++ b/orm/models_test.go
@@ -122,7 +122,7 @@ type Post struct {
 	Content string    `orm:"type(text)"`
 	Created time.Time `orm:"auto_now_add"`
 	Updated time.Time `orm:"auto_now"`
-	Tags    []*Tag    `orm:"rel(m2m)"`
+	Tags    []*Tag    `orm:"rel(m2m);rel_through(github.com/astaxie/beego/orm.PostTags)"`
 }
 
 func (u *Post) TableIndex() [][]string {
@@ -148,6 +148,16 @@ func NewTag() *Tag {
 	return obj
 }
 
+type PostTags struct {
+	Id   int
+	Post *Post `orm:"rel(fk)"`
+	Tag  *Tag  `orm:"rel(fk)"`
+}
+
+func (m *PostTags) TableName() string {
+	return "prefix_post_tags"
+}
+
 type Comment struct {
 	Id      int
 	Post    *Post     `orm:"rel(fk);column(post)"`
diff --git a/orm/orm_test.go b/orm/orm_test.go
index 8b81ea8b84c27d468d31d6e723a964a143c7e778..156fe754b54971e40ddfbbd95162d6423bea795d 100644
--- a/orm/orm_test.go
+++ b/orm/orm_test.go
@@ -146,6 +146,7 @@ func TestSyncDb(t *testing.T) {
 	RegisterModel(new(Tag))
 	RegisterModel(new(Comment))
 	RegisterModel(new(UserBig))
+	RegisterModel(new(PostTags))
 
 	err := RunSyncdb("default", true, false)
 	throwFail(t, err)
@@ -161,6 +162,7 @@ func TestRegisterModels(t *testing.T) {
 	RegisterModel(new(Tag))
 	RegisterModel(new(Comment))
 	RegisterModel(new(UserBig))
+	RegisterModel(new(PostTags))
 
 	BootStrap()