Lin Xi-Yi, as a scholar in the late Southern Song Dynasty, has a close relationship with the Ai Xuan School and is renowned for his position in the syncretism of three religions. Thus, his work "Verbal Interpretation of Lieh Tzu" plays a significant role in the study of Lieh Tzu's theory. This article analyzes Lin Xi-Yi's work, "Verbal Interpretation of Lieh Tzu, "and explores the state of emptiness and tranquility in terms of his theory of mind-the cultivation of no mindfulness. The paper is divided into three parts. First, "emptiness" as a metaphysical basis. Second, the idea of "non-persistent mind." Third, the meaning of "cultivation of no mindfulness." These concepts illustrate the significance of Lin Xi-Yi's theory of mind in the history of academic thoughts in the Southern Song Dynasty. They also reveal how he puts his theory into practice in his book, "Verbal Interpretation of Lieh Tzu."