Cheng Brother were famous Neo-Confucianists，and had a great influence on the development of Confucianism in the Song and Ming dynasties.Cheng Brother pay attention to Mencius as spring up the theory on the human nature and human life，praise Mencius and demote Xunzi.Because of Evilness of Human Nature，Xunzi was excluded from Confucian orthodoxy.Under the influence of the criticisms，the memorial tablets in the temple was cancelled，and Xunzi philosophy suffered a cold treatment for almost a thousand years.