"Things present are judged by things past",means that review is quite important in the study,how to give a good review lesson is a problem teachers are concerned about all the time.

Both Chinese past thinkers and western educational psychologists think that activation of students gained experience, connections of old and new knowledge can help students to revise the old and understand the new, can stimulate students thinking and encourage students to study efficiently, which offers an important psychological ground for the class introduction art.

By comparing the epistemological proposition of "Congenital Comprehensive Judgment" by Kant and that of "Born with Knowledge" and "Learn to Get Knowledge" by Confucius,this opinion can be proved.