吉藏（549-623）被視為三論宗的開宗論主，一生經歷四個朝代：南朝的梁、陳，及其後的隋、唐。在隋煬帝（569-618）的邀請下，吉藏於開皇十九年（599）由江南遷到關中。他駐鍚的寺院由紹興嘉祥寺（591-599），到江都慧日道場（599），再遷居到長安日嚴寺（599-618），最後寂滅於長安實際寺（623）。吉藏由江南到關中，將江南的三論思想再度回傳到關中。吉藏一生所學，依其在《法華統略》中自陳：「少弘四論，末專習一乘。」此中，一乘即指《法華經》中「唯有一乘法，無二亦無三」的思想。學界認為吉藏由江南遷徒到關中後，受到京師欣尚《法華》的影響，不得不特重《法華》，「意味著吉藏晚年信仰上的轉變」，此說是否屬實？其歷程如何？原因為何？何以在其晚年三論宗即將大成之際，卻轉而專修《法華》？吉藏早年是否曾受三論師承之影響而重視《法華》？南北朝時間，對《法華經》的重視是否只限於關中？此均為本文關注之處。透過前述問題的剖析，我們試著將吉藏放在歷史長流中，還原當時的時空背景，通過歷史脈胳，全面性瞭解吉藏修習《法華經》的歷程。本文試圖透過釐清以下三個面向，瞭解吉藏接觸法華思想的過程：一、吉藏早年在會稽時，是否存有接觸《法華》的證據及事實；二、吉藏是否受智顗法華思想的影響；三、關河三論學團是否亦有《法華》的傳承。本文首先探討南北朝時間，南朝是否亦崇奉《法華》，釐清吉藏早期是否受南朝崇奉《法華》的影響；接著討論《續高僧傳》所載吉藏的修持方法，是否與天台《法華》的修持法門有關？最後探討關河舊宗的《法華》傳承，吉藏入興皇法朗門下，是否即已同時接觸到此一傳承？本文認為吉藏早期投入興皇門下時，除接受三論思想的洗禮之外，即已同時接觸關河的法華思想，並非中年遷徒到京師後才轉重《法華》。對三論學團而言，當時的關河舊宗並無宗派意識，亦無只重三論，不重其它經典之事，吉藏早年即已同時領解法華及三論的思想。透過上述分析，本文認為吉藏並無晚年信仰轉變之事。

Jizang (549-623) is regarded as the founder of the Three-Treatise school. He lived through four dynasties: Southern Liang, Chen, Sui and Tang Dynasty. Under the invitation of Emperor Yang in Sui Dynasty (569-618), Jizang migrated from the south of the Yangtze River to the Guanzhong area in 599. He was first stationed in Shaoxing Jiaxiang Temple (591-599) and later moved to Jiangdu Huidi Temple (599), eventually settling in Chang' an Riyan Temple (599-618). He died in Chang' an Real Temple (623). From Jiangnan to Guanzhong, Jizang spread the thoughts of Three-Treatise school of Jiangnan back to Guanzhong. According to the The Summary and Brief of Lotus Sutra, the teaching of Jizang was focused on the one Mahayana doctrine. Scholars think that when Jizang migrated to Guanzhong, being influenced by the people of the capital preferring Lotus Sutra he had completely transformed his thought and faith. However, is that true? How and why did it happen? Why in his late years, as Three-Treatise school came into popularity, he switched instead to Lotus Sutra? Were the early days of Jizang influenced by the teachers of the Three- Treatise school in Jiangnan, who emphasized the Lotus Sutra? During the time of the Northern and Southern Dynasties, was the emphasis of the Lotus Sutra limited to Guanzhong? These are the focus of this article.