This master’s thesis is based on the Chinese Buddhist Jizang’s Commentary on the Diamond Sutra. In order to realize how Jizang interpreted Diamond Sutra, this paper focuses on the relation between two important Chinese Buddhism philosophy concepts: “mind” and “phenomenon.” Jizang’s Commentary on the Diamond Sutra, especially his interpretation of the relation between “mind” and “phenomenon,” could provide the Chinese Buddhism San-Lun-School a philosophical understanding of the Diamond Sutra. This paper is divided into six chapters. The first chapter introduces the research method and establishes the investigated topic. The second chapter analyzes how Jizang explains the first question in Diamond Sutra—how to confront the mind of annoyance—and through his answer shows Jizang’s understanding of “mind.” The third chapter discusses Jizang’s analysis of “phenomenon.” He combines two methods to explain that all “phenomenon” could be shown to be a wrong way of thinking, including the method of itself. The fourth chapter expounds Jizang’s idea of the mind-phenomenon relation. He uses concepts like “attachment,” “abidingness,” “non-attachment,” and “non-abidingness” to elucidate the appropriate relation between “mind” and “phenomenon.” The fifth chapter details Jizang’s transcendence of the original mind-phenomenon relation, attempting to lead the reader to comprehend the ultimate reality of Buddhism. The final chapter summarizes the research results of this paper, showing Jizang’s philosophy of mind and phenomenon in Diamond Sutra.