Since Chen Tuan brought up his theories, Tu-shu Yixue in the Song Dynasty, different from traditional philosophical thinking, has been approached and interpreted in innovative ways, known for its richness in contents both in the fields of Xiangshu and Yili, and for its wider scope of interpretation. Zhouyi Tu is a diverse collection of Yidiagrams in the Song Dynasty, highly representative of theories of that era. However, due to the debate over the real author of the book and the decline of mechanical Yidiagrams, the issues covered in the book on the history of Yixue and the author’s opinions have long been neglected and underestimated. Hence, by exploring the 108 diagrams portrayed in the book and by delving into its rich content, the present study aims to determine when the book was written, discuss the contents of relevant Tushuo, especially manifested in the cosmology of yin and yang and the important meanings it conveys, taking into consideration the characteristics and lineage of Tu-shi, the structures and philosophical meanings of the arrangements of numbers and symbols, the evolution of Taiji, xian-hou-tian and Fuxi Tushuo, Gua-bian Tushuo, the explanations of 64 Gua in Xiangshu and Yili, the interpretations of Tushi in Yizhuan, Tu-shi in Xiangshi in Yi, and the historical development of Yixue. Through a complete and thorough research, this year-long study aims to provide a comprehensive and detailed analysis of the theories in the book, clarify the dimensions of Yixue
development reflected by Yi-diagrams, and establish the potential inheritance relationships among these diagrams, hoping to give an indication of the role the book plays in history, and offer an philosophical explanation of Tushi structure.