Ever since the late Qing dynasty, there has repeatedly appeared the mistaken idea of education as useless due to varied social backgrounds and causes. In the late Qing the cultural factors in the transition from old to new constitute the cause, while during the great cultural revolution, class struggle is the central task, politics becomes principal cause. Since the end of the great cultural revolution class struggle gives way to economic activities. Besides, the convenience of educational opportunity, individual education costs and low income after graduation collectively form the three restrictions.