This paper focuses on four important quotations from Daosui’s 道邃 （ca. 735-811） Zhiguan ji zhong yiyi 止観記中異義 in Zhengzhen’s 証真 （ca. 1124-1220） Zhiguan siji 止観私記, and points out their differences in vocabulary and sentences. It also investigates the intentions of quoting the Zhiguan ji zhong yiyi in the Zhiguan siji.
Comparing the four quotations in the Zhiguan siji with their original texts in the Zhiguan ji zhong yiyi, we find that there are cases where missing characters or typographical errors can be found in the Zhiguan siji. As a result, the meanings of their contexts cannot be well understood in some places. Furthermore, based on Zhengzhen’s commentary to those four quotations, it is found that he intended to avoid assertive words, and adopted the explanation of the Zhiguan ji zhong yiyi to assert his point of view; he also criticized Zhanran’s （711-782） explanation in the Mohezhiguan fuxing chuanhong jue摩訶止観輔行伝弘決 which is different from his theory.
