diff --git a/object/user_test.go b/object/user_test.go
index 06215ffc..a117ec2a 100644
--- a/object/user_test.go
+++ b/object/user_test.go
@@ -97,3 +97,14 @@ func TestGetMaskedUsers(t *testing.T) {
 		})
 	}
 }
+
+func TestGetUserByField(t *testing.T) {
+	InitConfig()
+
+	user := GetUserByField("built-in", "DingTalk", "test")
+	if user != nil {
+		t.Logf("%+v", user)
+	} else {
+		t.Log("no user found")
+	}
+}
diff --git a/object/user_util.go b/object/user_util.go
index 1a92bd5e..271cc6eb 100644
--- a/object/user_util.go
+++ b/object/user_util.go
@@ -29,7 +29,7 @@ func GetUserByField(organizationName string, field string, value string) *User {
 	}
 
 	user := User{Owner: organizationName}
-	existed, err := adapter.Engine.Where(fmt.Sprintf("%s=?", field), value).Get(&user)
+	existed, err := adapter.Engine.Where(fmt.Sprintf("%s=?", strings.ToLower(field)), value).Get(&user)
 	if err != nil {
 		panic(err)
 	}