In this thesis the author firstly investigates various terms related to tathagatagarbha in the Srimalasutra. Secondly he focuses on the languages features of its Sanskrit fragments in the Schøyen Collection. It turns out that none of their noticeable language features can ultimately suggest the school-affiliation of the Srimalasutra. Thirdly he analyzes its paleographical features. Besides, the author conducts an initial study of textual history the Srimalasutra, and discusses the older recension(s) of the Srimalasutra based on the Sanskrit morphology, criteria of lectio difficilior and lectio facilior, ascertainment of later contents in the course of transmission, and the development of Buddhist doctrine. Finally he provides a careful textual collation, and makes an annotated translation.