diff --git a/.example/util/gvalid/gvalid.go b/.example/util/gvalid/gvalid.go
index a21b63f77..4d6212876 100644
--- a/.example/util/gvalid/gvalid.go
+++ b/.example/util/gvalid/gvalid.go
@@ -48,11 +48,13 @@ func main() {
 		"passport":  "john",
 		"password":  "123456",
 		"password2": "1234567",
+		"name":      "gf",
 	}
 	rules := map[string]string{
 		"passport":  "required|length:6,16",
 		"password":  "required|length:6,16|same:password2",
 		"password2": "required|length:6,16",
+		"name":      "size:5",
 	}
 	msgs := map[string]interface{}{
 		"passport": "账号不能为空|账号长度应当在:min到:max之间",
@@ -60,6 +62,7 @@ func main() {
 			"required": "密码不能为空",
 			"same":     "两次密码输入不相等",
 		},
+		"name": "名字长度必须为:size",
 	}
 	if e := gvalid.CheckMap(context.TODO(), params, rules, msgs); e != nil {
 		g.Dump(e.Maps())
diff --git a/.example/util/gvalid/gvalid_i18n.go b/.example/util/gvalid/gvalid_i18n.go
index dccde019c..cb2a5e905 100644
--- a/.example/util/gvalid/gvalid_i18n.go
+++ b/.example/util/gvalid/gvalid_i18n.go
@@ -10,12 +10,14 @@ import (
 
 func main() {
 	type User struct {
-		Name string `v:"required#ReuiredUserName"`
-		Type int    `v:"required#ReuiredUserType"`
+		Name    string `v:"required#ReuiredUserName"`
+		Type    int    `v:"required#ReuiredUserType"`
+		Project string `v:"size:10#MustSize"`
 	}
 	var (
 		data = g.Map{
-			"name": "john",
+			"name":    "john",
+			"project": "gf",
 		}
 		user  = User{}
 		ctxEn = gi18n.WithLanguage(context.TODO(), "en")
diff --git a/.example/util/gvalid/i18n/en.toml b/.example/util/gvalid/i18n/en.toml
index bcca1267d..7d1f481c8 100644
--- a/.example/util/gvalid/i18n/en.toml
+++ b/.example/util/gvalid/i18n/en.toml
@@ -5,6 +5,7 @@
 
 "ReuiredUserName" = "Please input user name"
 "ReuiredUserType" = "Please select user type"
+"MustSize"        = "Size of :attribute must be :size"
 
 
 
diff --git a/.example/util/gvalid/i18n/zh-CN.toml b/.example/util/gvalid/i18n/zh-CN.toml
index 750787e56..3db393e20 100644
--- a/.example/util/gvalid/i18n/zh-CN.toml
+++ b/.example/util/gvalid/i18n/zh-CN.toml
@@ -4,6 +4,7 @@
 
 "ReuiredUserName" = "请输入用户名称"
 "ReuiredUserType" = "请选择用户类型"
+"MustSize"        = ":attribute长度必须为:size"
 
 
 
diff --git a/util/gvalid/gvalid.go b/util/gvalid/gvalid.go
index 275b17771..7d8155136 100644
--- a/util/gvalid/gvalid.go
+++ b/util/gvalid/gvalid.go
@@ -47,6 +47,7 @@ import (
 // length               format: length:min,max                        brief: Length between :min and :max. The length is calculated using unicode string, which means one chinese character or letter both has the length of 1.
 // min-length           format: min-length:min                        brief: Length is equal or greater than :min. The length is calculated using unicode string, which means one chinese character or letter both has the length of 1.
 // max-length           format: max-length:max                        brief: Length is equal or lesser than :max. The length is calculated using unicode string, which means one chinese character or letter both has the length of 1.
+// siz                  format: size								  brief: Length must be :size. The length is calculated using unicode string, which means one chinese character or letter both has the length of 1.
 // between              format: between:min,max                       brief: Range between :min and :max. It supports both integer and float.
 // min                  format: min:min                               brief: Equal or greater than :min. It supports both integer and float.
 // max                  format: max:max                               brief: Equal or lesser than :max. It supports both integer and float.
@@ -143,6 +144,7 @@ var (
 		"length":               {},
 		"min-length":           {},
 		"max-length":           {},
+		"size":                 {},
 		"between":              {},
 		"min":                  {},
 		"max":                  {},
@@ -200,6 +202,7 @@ var (
 		"length":                "The :attribute value length must be between :min and :max",
 		"min-length":            "The :attribute value length must be equal or greater than :min",
 		"max-length":            "The :attribute value length must be equal or lesser than :max",
+		"size":                  "The :attribute value length must be :size",
 		"between":               "The :attribute value must be between :min and :max",
 		"min":                   "The :attribute value must be equal or greater than :min",
 		"max":                   "The :attribute value must be equal or lesser than :max",
diff --git a/util/gvalid/gvalid_validator_check.go b/util/gvalid/gvalid_validator_check.go
index 9c01f21c2..089f95044 100644
--- a/util/gvalid/gvalid_validator_check.go
+++ b/util/gvalid/gvalid_validator_check.go
@@ -163,7 +163,8 @@ func (v *Validator) doCheckBuildInRules(
 	case
 		"length",
 		"min-length",
-		"max-length":
+		"max-length",
+		"size":
 		if msg := v.checkLength(valueStr, ruleKey, rulePattern, customMsgMap); msg != "" {
 			return match, errors.New(msg)
 		} else {
diff --git a/util/gvalid/gvalid_validator_rule_length.go b/util/gvalid/gvalid_validator_rule_length.go
index 33edfa97a..7bd5b188e 100644
--- a/util/gvalid/gvalid_validator_rule_length.go
+++ b/util/gvalid/gvalid_validator_rule_length.go
@@ -58,6 +58,13 @@ func (v *Validator) checkLength(value, ruleKey, ruleVal string, customMsgMap map
 			msg = v.getErrorMessageByRule(ruleKey, customMsgMap)
 			msg = strings.Replace(msg, ":max", strconv.Itoa(max), -1)
 		}
+
+	case "size":
+		size, err := strconv.Atoi(ruleVal)
+		if valueLen != size || err != nil {
+			msg = v.getErrorMessageByRule(ruleKey, customMsgMap)
+			msg = strings.Replace(msg, ":size", strconv.Itoa(size), -1)
+		}
 	}
 	return msg
 }
diff --git a/util/gvalid/gvalid_z_unit_basic_all_test.go b/util/gvalid/gvalid_z_unit_basic_all_test.go
index fa687880c..75f22609b 100755
--- a/util/gvalid/gvalid_z_unit_basic_all_test.go
+++ b/util/gvalid/gvalid_z_unit_basic_all_test.go
@@ -702,6 +702,16 @@ func Test_MaxLength(t *testing.T) {
 	}
 }
 
+func Test_Size(t *testing.T) {
+	rule := "size:5"
+	if m := gvalid.CheckValue(context.TODO(), "12345", rule, nil); m != nil {
+		t.Error(m)
+	}
+	if m := gvalid.CheckValue(context.TODO(), "123456", rule, nil); m == nil {
+		t.Error("长度校验失败")
+	}
+}
+
 func Test_Between(t *testing.T) {
 	rule := "between:6.01, 10.01"
 	if m := gvalid.CheckValue(context.TODO(), 10, rule, nil); m != nil {
diff --git a/util/gvalid/i18n/cn/validation.toml b/util/gvalid/i18n/cn/validation.toml
index fab6dfba6..fb6c7c787 100644
--- a/util/gvalid/i18n/cn/validation.toml
+++ b/util/gvalid/i18n/cn/validation.toml
@@ -28,6 +28,7 @@
 "gf.gvalid.rule.length"               = ":attribute 字段长度为:min到:max个字符"
 "gf.gvalid.rule.min-length"           = ":attribute 字段最小长度为:min"
 "gf.gvalid.rule.max-length"           = ":attribute 字段最大长度为:max"
+"gf.gvalid.rule.size"                 = ":attribute 字段长度必须为:size"
 "gf.gvalid.rule.between"              = ":attribute 字段大小为:min到:max"
 "gf.gvalid.rule.min"                  = ":attribute 字段最小值为:min"
 "gf.gvalid.rule.max"                  = ":attribute 字段最大值为:max"
diff --git a/util/gvalid/i18n/en/validation.toml b/util/gvalid/i18n/en/validation.toml
index 7dc56cab0..4de5880d2 100644
--- a/util/gvalid/i18n/en/validation.toml
+++ b/util/gvalid/i18n/en/validation.toml
@@ -28,6 +28,7 @@
 "gf.gvalid.rule.length"               = "The :attribute value length must be between :min and :max"
 "gf.gvalid.rule.min-length"           = "The :attribute value length must be equal or greater than :min"
 "gf.gvalid.rule.max-length"           = "The :attribute value length must be equal or lesser than :max"
+"gf.gvalid.rule.size"                 = "The :attribute value length must be :size"
 "gf.gvalid.rule.between"              = "The :attribute value must be between :min and :max"
 "gf.gvalid.rule.min"                  = "The :attribute value must be equal or greater than :min"
 "gf.gvalid.rule.max"                  = "The :attribute value must be equal or lesser than :max"
diff --git a/util/gvalid/testdata/i18n/cn/validation.toml b/util/gvalid/testdata/i18n/cn/validation.toml
index 0cc409eb5..531aaa2ca 100644
--- a/util/gvalid/testdata/i18n/cn/validation.toml
+++ b/util/gvalid/testdata/i18n/cn/validation.toml
@@ -28,6 +28,7 @@
 "gf.gvalid.rule.length"               = ":attribute 字段长度为:min到:max个字符"
 "gf.gvalid.rule.min-length"           = ":attribute 字段最小长度为:min"
 "gf.gvalid.rule.max-length"           = ":attribute 字段最大长度为:max"
+"gf.gvalid.rule.size"                 = ":attribute 字段长度为必须为:size"
 "gf.gvalid.rule.between"              = ":attribute 字段大小为:min到:max"
 "gf.gvalid.rule.min"                  = ":attribute 字段最小值为:min"
 "gf.gvalid.rule.max"                  = ":attribute 字段最大值为:max"
diff --git a/util/gvalid/testdata/i18n/en/validation.toml b/util/gvalid/testdata/i18n/en/validation.toml
index 7dc56cab0..4de5880d2 100644
--- a/util/gvalid/testdata/i18n/en/validation.toml
+++ b/util/gvalid/testdata/i18n/en/validation.toml
@@ -28,6 +28,7 @@
 "gf.gvalid.rule.length"               = "The :attribute value length must be between :min and :max"
 "gf.gvalid.rule.min-length"           = "The :attribute value length must be equal or greater than :min"
 "gf.gvalid.rule.max-length"           = "The :attribute value length must be equal or lesser than :max"
+"gf.gvalid.rule.size"                 = "The :attribute value length must be :size"
 "gf.gvalid.rule.between"              = "The :attribute value must be between :min and :max"
 "gf.gvalid.rule.min"                  = "The :attribute value must be equal or greater than :min"
 "gf.gvalid.rule.max"                  = "The :attribute value must be equal or lesser than :max"