This paper examines following problems: 1. What is the core contents of various versions of Tripitaka from Song to Qing Dynasties. 2. What are the criteria of compiling these versions of Tripitaka? Are their criteria reasonable? In other words, are the Buddhist sutras compiled into the tripitaka the important ones? Are there any important Buddhist sutras not compiled into the Tripitaka? 3. Taisho Tripitaka is the most popular Tripitaka nowadays. What are its characteristics in compilation? In the treatment of compilation, What are the specialities of Taisho Tripitaka superior to other old Tripitakas?