"Health preservation" is an important part of Chinese culture, and Daoism is placing special emphasis on it. In contemporary society, discussions about "health preservation" often associated with the “周易”. However, in the current academic field, there is not much enthusiasm for research on the relationship between Yi, Daoism, and health preservation. Therefore, this study aims to use the “易學” as a key to explore the methods of health preservation and cultivation of immortality in Daoist classics from the Han and Tang dynasties. Through this, a deeper understanding of the philosophy of health preservation can be achieved.
Therefore, this study selected Daoist classics from the Han and Tang dynasties, including the “太平經”, “老子想爾注”, “周易參同契”; “抱朴子內篇”, “黃庭經”, “黃帝陰符經”, “養性延命錄”, “備急千金要方”, “天隱子”, “宗玄先生玄綱論” ,“太上九要心印妙經” and “鍾呂傳道集” totaling twelve Daoist classics,and divided into three chapters to discussion.
Based on the results of the compilation, three conclusions can be drawn. Firstly, during the Han and Tang dynasties, Daoist health preservation emphasized the importance of "教規" and "丹藥." In the Wei and Jin dynasties, Daoist health preservation focused on the relationship between the "世界" and the "身體," while in the Sui and Tang dynasties, health preservation and cultivation of immortality emphasized the preservation of "陽氣" within the body. Secondly, during the Han dynasty, Daoist health preservation passively incorporated the teachings of Yi (the Book of Changes) due to the prevalence of "陰陽災異." In the Wei and Jin dynasties, Daoist health preservation actively integrated Yi studies due to the popularity of "玄學." In the Sui and Tang dynasties, health preservation in Daoism embraced Yi studies as a guideline to enrich the philosophical content. Finally, a comprehensive analysis of the relationship between Daoist health preservation, cultivation of immortality, and Yi studies reveals that the Han dynasty marked the "形成期" of the integration between Daoism and Yi, the Wei and Jin dynasties represented the "發展期" of this integration, and the Sui and Tang dynasties embodied the "成熟期" of this integration.