In 1931 and 1932, Debating on the difference of Yogācāra latter phi1osophy and Yogācāra former philosophy, Venerable Yin Shun started to study on Mahāyāna-sarpparigraha-śāstra school. Venerable Yin Shun gradually set up the interpretation standpoint of Middle-way to Mahāyāna-sarpparigraha- śāstra school. In his book the Lecture sheets of Mahāyāna-sarpparigraha- śāstra, and Discussion with Mao Zong-san, Venerable Yin Shun insisted fully on the Middle-way. However, in Venerable Yin Shun;s later years, He published the article Qi-xin-lun and Fu-nan mahā-yāna, which indicated that he abandoned the Middle-way and selected the interpretation standpoint of original Enlightened of Qi-xin-lun. The change of Venerable Yin Shun’s Middle-way tallied with the development of thought history of Mahāyāna-sarpparigraha- śāstra school. We can find the thought historyfrom the Mahāyāna-sarpparigraha- śāstra school to Qi-xin-lun, and we must study and inherit it.