diff --git a/modules/ssau_parser/database.go b/modules/ssau_parser/database.go
index a6d0435..55ec338 100644
--- a/modules/ssau_parser/database.go
+++ b/modules/ssau_parser/database.go
@@ -5,7 +5,8 @@ import (
 	"xorm.io/xorm"
 )
 
-func uploadShedule(db *xorm.Engine, sh Shedule) {
+func uploadShedule(db *xorm.Engine, sh Shedule) error {
+	var pairs []database.Lesson
 	for _, line := range sh.Lessons {
 		for _, lesson := range line {
 			var pair database.Lesson
@@ -16,15 +17,27 @@ func uploadShedule(db *xorm.Engine, sh Shedule) {
 					Type:      subLesson.Type,
 					Name:      subLesson.Name,
 					TeacherId: subLesson.TeacherId,
-					Place:     subLesson.Place,
-					Comment:   subLesson.Comment,
-					SubGroup:  subLesson.SubGroup,
 				}
 				for _, groupId := range subLesson.GroupId {
 					pair.GroupId = groupId
-					db.InsertOne(pair)
+					var existsLessons []database.Lesson
+					err := db.Find(&existsLessons, pair)
+					if err != nil {
+						return err
+					}
+					if len(existsLessons) == 0 {
+						pair.Place = subLesson.Place
+						pair.Comment = subLesson.Comment
+						pair.SubGroup = subLesson.SubGroup
+						pairs = append(pairs, pair)
+					}
 				}
 			}
 		}
 	}
+	if len(pairs) > 0 {
+		_, err := db.Insert(pairs)
+		return err
+	}
+	return nil
 }
diff --git a/modules/ssau_parser/ssau_parser_test.go b/modules/ssau_parser/ssau_parser_test.go
index d8f5dfd..3038348 100644
--- a/modules/ssau_parser/ssau_parser_test.go
+++ b/modules/ssau_parser/ssau_parser_test.go
@@ -49,5 +49,8 @@ func TestParse(t *testing.T) {
 	}
 
 	engine := database.Connect(os.Getenv("MYSQL_USER"), os.Getenv("MYSQL_PASS"), os.Getenv("MYSQL_DB"))
-	uploadShedule(engine, *shedule)
+	err = uploadShedule(engine, *shedule)
+	if err != nil {
+		t.Error(err)
+	}
 }