The Chanmen koujue 禅門口訣 was taught by Zhiyi 智顗. In this paper, I try to clarify the characteristics of the Chanmen koujue through comparison with the Shichan boluomi cidi famen 釈禅波羅蜜次第法門, the first lecture of Zhiyi. As a result, it became clear that the Chanmen koujue describeds how Zhiyi understood the various Chan contemplations.
