For Xunzi, sensibility is the root of human nature that is of Man in Genenral, and variability in sensibility acts often as the reason for badness in man. In our paper, through the response of Rites to such variability, we try to determine the inner mechanism of the function of sensibility, and that is, the mode of operation that in all situations man necessarily distinguishes I and the other and treats as basic its own self-feeling. The badness of man arises when its self-feeling turns negative, and that has forresult the variability of sensibility. Through the above analysis, we explain in brief the nature and end of Rites, the general difficulties of the Self, as well as its positive ground, the effectiveness of the education of Rites, and the reason why evilness in human nature still can have good deeds.