The debate between Zhu Xi and Lu Jiuyuan was a great philosophical event in the Song Dynasty. Zhu Xi was a famous philosopher and educator of the Southern Song Dynasty who inherited Daoxue (“Learning of the Way”) from Cheng Yi and Cheng Hao and founded Lixue (“School of Universal Principles”), which was later known as the Cheng-Zhu School of Confucianism. Zhu was the leader of Lixue in the Southern Song Dynasty. Lu Jiuyuan was the founder of Xinxue (“School of the Mind”), an example of subjective idealism during the Song and Ming dynasties. Zhu Xi and Lu Jiuyuan were close friends, but they held diametrically opposing and uncompromisingly different academic views. In the 7^th year of the Chunxi reign, the year following the year in which Zhu Xi began to presided over the Bailudong (“White Deer Grotto”) Academy at Mount Lushan, Zhu invited Lu Jiuyuan to lecture at the academy. This is known as the Yi Li Zhi Bian (“Debate on Moral Principles and Profit”). This academic salon initiated the practice of inviting famous scholars to lecture at academies, and helped turn jianghui (debate) into an important way of teaching at academies and promote the development of academic education and academic prosperity.