High school is the very important stage for students, even the turning point of their lives. Once they learn well, they can enter the ideal university and fulfill their dreams. So a lot of students pay all their attention to the study and ignore joining the after-class activity. They think it is a waste of time to do it, instead they’d rather put more time to make up their lessons. It is the common misunderstanding of after-class activity. On the one hand, taking the activity can help students reduce their pressure. When students face the lessons all the time, they are nervous and easy to stuck in the difficulty. The activity brings students the happy hour and forget their worries. On the other hand, the activity can broaden students’ vision and enrich their knowledge, which are useful in their lessons. So after-class life is also the part of students’ lives, don’t refuse it.