Since the system of etiquette and music was established, music has been considered to be an instrument for teaching, and the practical value has surpassed the appreciation of the beauty. The Music Book submits that the harmonious tone's musical aesthetic feeling can affect human heart and achieve the goal of transforming social traditions. Until the period of Wei-Jin dynasty, Xun-zi and Ji-kang inherited The Music Book concept and was influenced by Lao-Zhuang. Besides discussing the identity of music, it has further explained the viewpoint of music can and also transformed social traditions. This thesis will contrast and analyze two works-Music Theory and Tone without Sadness and Happiness-and discuss social meaning of Xun-zi and Ji-kang's music teaching concept. By the mention above, we can observe that the world of musical aesthetic was established during the period of that age.