diff --git a/migrator/migrator.go b/migrator/migrator.go
index d4989410..afc3e44b 100644
--- a/migrator/migrator.go
+++ b/migrator/migrator.go
@@ -440,7 +440,7 @@ func (m Migrator) MigrateColumn(value interface{}, field *schema.Field, columnTy
 	}
 
 	// check unique
-	if unique, ok := columnType.Unique(); ok && unique != field.Unique {
+	if unique, ok := columnType.Unique(); ok && !(unique == field.Unique || field.UniqueIndex == unique) {
 		// not primary key
 		if !field.PrimaryKey {
 			alterColumn = true
diff --git a/schema/field.go b/schema/field.go
index d6df6596..7d8704f6 100644
--- a/schema/field.go
+++ b/schema/field.go
@@ -68,6 +68,7 @@ type Field struct {
 	DefaultValue           string
 	DefaultValueInterface  interface{}
 	NotNull                bool
+	UniqueIndex            bool
 	Unique                 bool
 	Comment                string
 	Size                   int
@@ -114,6 +115,7 @@ func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
 		HasDefaultValue:        utils.CheckTruth(tagSetting["AUTOINCREMENT"]),
 		NotNull:                utils.CheckTruth(tagSetting["NOT NULL"], tagSetting["NOTNULL"]),
 		Unique:                 utils.CheckTruth(tagSetting["UNIQUE"]),
+		UniqueIndex:            utils.CheckTruth(tagSetting["UNIQUEINDEX"]),
 		Comment:                tagSetting["COMMENT"],
 		AutoIncrementIncrement: 1,
 	}