We can say the Jingdu-Sanmei-Jing, which is called forged sutra, was compiled or translated into Chinese by Tanyao (雲曜) in period of Bei W ei (北魏). I have confidence that it is a forged sutra. [After the prohibition of Buddhism in Bei Wei, Tanyao as a national archbishop had gone full steam ahead with the reconstruction of Buddhism, and as a part of it he had compiled this sutra.] This sutra had been often been quoted in many classical books of Buddhism, such as the Jinglu- Yixiangand the Santai-Fofa, and the people at that time had a common interest in the ideology of Buddhism as presented in this sutra. In this thesis, I have studyed the passages quoted from Jingdu-Sanmei-Jing, specially those found in the Anleji (安楽集) by Daochuo and Guan...