Because of the contradiction between ideal and reality，value rationality and instrumental rationality，how to integrate knowledge and action at the level of internal sage and external Kingdom has become the subject of Confucianism in the Ming and Qing Dynasties. In the early Qing Dynasty，Sun Qifeng set strict standards for saints in the Confucian system，drew Confucius to pass through King Zhu Luwang，refined the relationship between knowledge and practice into seeking and practicing“Confucius'Tao”. With his return and reinterpretation of Confucian and Mencius classics，he integrated the internal saintly thought of various schools of Confucianism and the practice of“combining etiquette with reason”on the basis of“Three Outlines and Five Constants without Taoism”.It is bridged. Yan Yuan，on the basis of Sun Qifeng，adopted a more stringent attitude towards the choice of saints. He only recognized the character of Confucius and rejected the leaders of Confucianism after three generations. He returned to the three generations of saints and Confucius under the banner of“seeking and practicing the right path of Zhou Confucius”，and melted and cast the resources of“Three Things，Six Governments”，Six Arts Practice，Literature and Martial Arts. Fermi refined and reconstructed Sun Qifengxun's“Confucius's Way”into“seeking and practicing the Tao of the Middle”，constructed“Taoism”and“Tao vein”，criticized Neo-Confucianism in Song and Ming Dynasties，attached importance to Confucianism in Han and Tang Dynasties，and devoted himself to the politics of Wang Dao. Yan Yuan and Fermi's exploration is a way to promote Sun Qifeng's academic development. Because they were rooted in different academic ecology in the early Qing Dynasty，they had different destinies.