diff --git a/util/gvalid/gvalid_check_map.go b/util/gvalid/gvalid_check_map.go
index 8f4b139c9..d24612790 100644
--- a/util/gvalid/gvalid_check_map.go
+++ b/util/gvalid/gvalid_check_map.go
@@ -89,8 +89,10 @@ func CheckMap(params interface{}, rules interface{}, messages ...CustomMsg) *Err
 		}
 		if e := doCheck(key, value, rule, customMsgs[key], data); e != nil {
 			_, item := e.FirstItem()
+			// ===========================================================
 			// If value is nil or empty string and has no required* rules,
 			// clear the error message.
+			// ===========================================================
 			if gconv.String(value) == "" {
 				required := false
 				// rule => error
diff --git a/util/gvalid/gvalid_check_struct.go b/util/gvalid/gvalid_check_struct.go
index ee368a0f0..400c1e848 100644
--- a/util/gvalid/gvalid_check_struct.go
+++ b/util/gvalid/gvalid_check_struct.go
@@ -151,8 +151,10 @@ func CheckStruct(object interface{}, rules interface{}, messages ...CustomMsg) *
 		}
 		if e := doCheck(key, value, rule, customMessage[key], params); e != nil {
 			_, item := e.FirstItem()
+			// ===========================================================
 			// If value is nil or empty string and has no required* rules,
 			// clear the error message.
+			// ===========================================================
 			if value == nil || gconv.String(value) == "" {
 				required := false
 				// rule => error
diff --git a/util/gvalid/gvalid_custom_rule.go b/util/gvalid/gvalid_custom_rule.go
index 45cd5d2e7..4cac5907e 100644
--- a/util/gvalid/gvalid_custom_rule.go
+++ b/util/gvalid/gvalid_custom_rule.go
@@ -25,7 +25,7 @@ var (
 // It returns error if there's already the same rule registered previously.
 func RegisterRule(rule string, f RuleFunc) error {
 	if _, ok := allSupportedRules[rule]; ok {
-		return fmt.Errorf(`validation rule "%s" is already registed`, rule)
+		return fmt.Errorf(`validation rule "%s" is already registered`, rule)
 	}
 	allSupportedRules[rule] = struct{}{}
 	customRuleFuncMap[rule] = f
diff --git a/util/gvalid/gvalid_unit_checkstruct_test.go b/util/gvalid/gvalid_unit_checkstruct_test.go
index 08b820040..84bfc197b 100755
--- a/util/gvalid/gvalid_unit_checkstruct_test.go
+++ b/util/gvalid/gvalid_unit_checkstruct_test.go
@@ -250,3 +250,32 @@ func Test_CheckStruct_With_Inherit(t *testing.T) {
 		t.Assert(err.Maps()["password2"], g.Map{"same": "您两次输入的密码不一致"})
 	})
 }
+
+func Test_CheckStruct_Optional(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		type Params struct {
+			Page      int    `v:"required|min:1        #page is required"`
+			Size      int    `v:"required|between:1,100#size is required"`
+			ProjectId string `v:"between:1,10000       #project id must between :min, :max"`
+		}
+		obj := &Params{
+			Page: 1,
+			Size: 1,
+		}
+		err := gvalid.CheckStruct(obj, nil)
+		t.Assert(err, nil)
+	})
+	gtest.C(t, func(t *gtest.T) {
+		type Params struct {
+			Page      int `v:"required|min:1        #page is required"`
+			Size      int `v:"required|between:1,100#size is required"`
+			ProjectId int `v:"between:1,10000       #project id must between :min, :max"`
+		}
+		obj := &Params{
+			Page: 1,
+			Size: 1,
+		}
+		err := gvalid.CheckStruct(obj, nil)
+		t.Assert(err.String(), "project id must between 1, 10000")
+	})
+}