OU YI was a Zen master in the late Ming Dynasty. He did lots of theoretical works to integrate the different schools of the Chinese Mahayana Buddhism, and to integrate the Confucianism and the Buddhism. He applied lots of the Buddhism theories to interpret the Confucianism' classics. It seems that the philosophy of the Confucianism is quite the same as the Buddhism in his works. Actually, he was just make the use of the opportunity of the interpretation of the Confucianism classics to introduce and widespread the philosophy of the Buddhism. Therefore, in the study of the methodology about the possibility of the integration between the philosophy of the Confucianism and the Buddhism was never really realized in the works of the Master OU YI. Still more to say the master even criticize the Confucianism in two things. First, the Confucianists never really love the life because they emphasize the virtue of kindness but not Vegetarians themselves. Second, the Confucianists never really know the meaning of the filial obligation because they didn't know the life after the death. In general, Master OU YI was a Buddhist in his nature, and his interpretation of Confucianism and integrating works between the Buddhism and Confucianism were all based on his Buddhist viewpoints.