Yueh-jih is the first publication about the origins and theories of music in ancient China. Yet the scope of Yueh-jih is quite broad, not limited to music. It includes the discussions of maintaining a peaceful mind of a person, establishing a harmonic climate of a society, and even reaching a Utopian state of the world. Therefore, the subtle educating power of Yueh-jih is crcuial to personality education. This study has three purposes: firstly, to clarify the meaning of Yueh-jih; secondly, to explore the characteristic and content of Yueh-jih, which includes the relationship of Yueh-jih and Lee-jih, the way of expressing inner feeling, the harmonic state of connecting Tao and personal desire, relation of Yueh to politics, and the artistic standpoints of Yueh-jih. Thirdly, the author summarizes three implications of Yueh-jih to personality education: Yueh enhances the ability of expressing personal emotions properly; Yueh-jih emphasizes personal endeavor of pursuing moral fulfilment; Yueh-jih focuses on the heuristic perspectives of whole person education.