Chiko's 智光 thought on Pure Land Buddhism can be known from his Muryojukyoron-shaku 無量寿経論釈. Muryojukyoron-shaku is a commentary on Vasubandhu's Wangsheng lun 往生論 based on Tanluan's 曇鸞 understanding as found in his Wangsheng lunzhu 往生論註. Therefbre, Chiko's Pure Land thought is often discussed in connection with Tanluan. However, because Chiko belonged to the Sanlun 三論 school, Jizang's 吉蔵 Pure Land thought also played an important role. In actuality, Chiko does adopt the interpretation method of Benji Ermen 本迹二門, which is a distinctive feature of Jizang's Pure Land thought. But this interpretation method carries a unique meaning within the Sanlun sect. In this paper, I wish to examine whether Chiko adequately understood this interpretation method of Benji Ermen.