律學從曹魏嘉平年間傳入中土，經過數代人的翻譯弘傳，辛苦經營，擁有了傳統律學的四律五論. 至唐時，律 學大備，蔚然成宗，形成南山宗，相部宗，東塔宗鼎足而立的局勢. 日後，相部，東塔兩系逐漸衰微，只南山一系傳承獨盛，綿延不絕. 本文從律學源流的角度考察了四分律學發展延續的基本脈絡及傳承系統. 重點對道宣律師生平力學，綜攬諸部，會通大小以成一家的創建給予分析，勾勒了《四分律》從傳入至立宗發展演化進程中，主律學思想和各種著疏產生變化的歷史線索. Vinaya was introduced into China during the reign of Chia-pin of T'sas Wei Dynasty. After the translation and propagation of several generations, four vinayas and five sastras of the traditional vinaya were established. By T'ang Dynasty，vinaya teachings were completed，and three vinaya schools, i.e. Nan-shan School，Hsiang-bu School，and Tong-ta School were formed. Afterwards, the Hsiang-bu School and the Tong-ta School gradually declined. Only the Nan-shan school，prospered without interruption. This paper investigates the basic context and lineage of the Dharmagupta-vinaya version from the angle of vinaya origin. The emphasis is on vinaya Master Tao-hsuan's life，learning，integrating different versions, and conglomerating Mahayana and Hinayana vinayas into a new school. This will outline the introduction and evolution of Dharmagupta-vinaya version，the major vinaya thoughts, and the transformation of different vinaya versions and their commentaries.