The Tong xue, be accustomed to a form of address in history of Confucian Classics, is to take it as representative that Annotated all Confucian Classics by Zheng xuan. This condition appears in the Eastern Han Dynasty last years. If we trace its headstream, the Tong xue originate in the Western Han Dynasty. Be the road of gaining benefit, the study of present Font of Confucian Classics becomes more and more tedious. then, the study of ancient Font of Confucian Classics are on the rise. The style of study incline to the wide range of studies and liberty between two Han dynasty. The Confucian persons suffered from numerous Confucian Classics expounding, so they like to condense. The ruler is also seeking a difference of five Confucian Classics. And a few bind become also loosening. so, the consciousness linking up all Confucian Classics forms gradually. Then, Zheng xuan expounded all Confucian Classics. Thereupon, the Tong xue arise at the historic moment.