It's generally thought that Xi Kang's Shengwu Aile Lun (on the Absence of Sentiments in Music) is opposed to the traditional music theory, Yue ji. This essay will firstly focus on how Xi Kang disputes the traditional music theory in the Shengwu Aile Lun. Through the analysis, we can further discuss and clarify whether Shengwu Aile Lun negates the ability of ”yi-feng yi-su 移風易俗” in music? If not, how does Xi Kang construct the dis-course?