The Sijiaoyi, T 1929.46.721a-769a. A twelve fascicle work by Zhiyi 智顗, the founder of Tiantai Buddhism. This treatise is devoted to the detailed and systematic exposition of the Four Teachings (one of the schemes by which the Buddhist sutras and treatises are arranged in the Tiantai tenet classification system). The four teachings are: (1) sancang 三藏the Tripitaka teaching; (2) tong 通 the Pervasive or 'shared' teaching; (3) bie 別 the Distinct teaching and (4) yuan 圓 the Complete teaching. Originally it formed a part of his commentary on the Vimalakīrti-nirdeśa-sūtra 維摩經, which he finished in 595 C.E.

凡六卷或十二卷。隋代智顗撰。收於大正藏第四十六冊。為別於天台四教儀而稱大本四教義。智顗所作之淨名（維摩）玄義前半部分為四教義六卷、四悉檀義二卷（缺）、三觀義二卷等三部分，四教義即其中之一，而別為刊行者。內容包括：釋四教名、辨所詮、明四門入理、明判位不同、明權實、約觀心、通經論等七科，分別闡釋藏、通、別、圓等四教之名與教義，且從各種觀點來解說四教之異同。亦即依四教以論述佛陀一代教化之大綱。註釋書有：四教義私記一卷（證真）、四教義資持記十二卷（皎空）、四教義箋錄一卷（本純）等。〔法華文句記卷一中、維摩經玄疏卷三、大唐內典錄卷十〕