This article studies the Baozang lun (Treasure Store Treatise) traditionally attributed to Seng Zhao (374-414). It first discusses this treatise's authorship and concludes that it was likely composed by Liu Ji, lay friend of Zhangjing Huaihui (754-815) who was Mazu Daoyi's (709-788) disciple, or Li Fan (d. 829), Mazu's lay disciple. The article then examines the main themes of the treatise and indicates that it presents clear features of integrating the Three Teachings.