The Zhiguan ji zhong yiyi 止観記中異義 of Daosui 道邃, the seventh patriarch of Tiantai 天台 in China, is a collection of dissenting opinions on the Zhiguan fuxing chuanhong jue 止観輔行伝弘決 （T. 1912） of Zhanran 湛然, compiled by Qianshu 乾淑 in 805. It is also an important work for indicating the features of Tiantai thought after Zhanran’s time. The Zhiguan ji zhong yiyi was introduced to Japan by Saichō 最澄 after his visit to Tang China. It was then widely circulated and several versions are extant. The Zhi guan ji zhong yiyi was not included in Chinese canons, but is preserved in the Zokuzōkyō 続蔵経 supplement to the canon （vol. 55, X 918）. This paper discusses how the Zhi guan ji zhong yiyi in the Zokuzōkyō was established.
