On the Reason for Li Gong's Confucian Classics Change

In the process of inheriting and developing Yan Yuan Learning,Li Gong has learned from textual research method of Confucian classics,which has strong and clear academic purpose.The true reason is to discriminate neo-Confucianism,prove Yan Learning and to better spread Yan Yuan Learning and establish the principle of Yan Li Learning,so that Yan Li Learning has become a systematic theory and provide evidence for the rulers to make laws as to confront against Cheng Tan and Zhu Xi Learning and even replace it.