diff --git "a/day5/\344\275\234\344\270\232/\344\275\234\344\270\232" "b/day5/\344\275\234\344\270\232/\344\275\234\344\270\232"
new file mode 100644
index 0000000000000000000000000000000000000000..dc3c7fd1361ba3d78725a898758c920ef1c9f96b
--- /dev/null
+++ "b/day5/\344\275\234\344\270\232/\344\275\234\344\270\232"
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+func contruct_struct() {
+	userType := reflect.TypeOf(User{})
+	userValue := reflect.New(userType)
+	userValue.Elem().FieldByName("age").SetInt(20)
+	if user, ok := userValue.Interface().(*User); ok {
+		fmt.Println(user.Gender)
+	}
+	u := User{Gender: true}
+	fmt.Println(u.Gender)
+}
+
+func construct_slice_and_update() {
+	sliceType := reflect.TypeOf([]User{})
+	sliceValue := reflect.MakeSlice(sliceType, 2, 10)
+	sliceValue.Index(0).Set(reflect.ValueOf(User{age: 10, Gender: true}))
+	sliceValue.Index(1).Set(reflect.ValueOf(User{age: 20, Gender: true}))
+
+	s := sliceValue.Interface().([]User)
+	fmt.Println(s[0].age)
+	fmt.Println(s[1].age)
+
+	sliceValue2 := reflect.ValueOf(&s)
+	sliceValue2.SetLen(4)
+	sliceValue2.Elem().Index(2).Set(reflect.ValueOf(.....))
+
+}
+
+func main() {
+	// contruct_struct()
+
+	s := sliceValue.Interface().([]User)
+	fmt.Println(s[0].age)
+	fmt.Println(s[1].age)
+
+	construct_slice_and_update()
+}