Xiong Shili 熊十力(1885-1968) was one of the most important Chinese philosophers of the twentieth century, and a founding figure of the modern New Confucian school of philosophy. At the core of his metaphysics is one of the key conceptual polarities in traditional Chinese philosophy: Reality (ti 體) and Function (yong 用). Xiong Shili’s Understanding of Reality and Function, 1920-1937 presents a detailed examination and analysis of the development of Xiong Shili’s conception of Reality and Function between 1920 and 1937. While scholars have tended to focus on Xiong’s mature ti-yong philosophical system, which was initially established in the early 1930s, this study explains how that system was gradually formed, providing a more comprehensive basis for understanding the development of Xiong’s philosophical thought in later periods.