As a social member, college student will inevitably be influenced by the other students and the society as a whole. Conformity is a psychological term that indicates the influence. It means that an individual tends to keep accordance with the majority under direction or pressure. Conformity is a common phenomenon among college students when they are having PE class or playing sports after class, which has a great effect on students’ physical activities, sport attitude and philosophy of life. This paper analyzes the effects of conformity on college students in sports and gives some practical suggestions to PE instructors about how to make use of conformity to help students change their attitude to sports and form lifelong sports habit.