Abstract: Just like other Chinese traditional science, this study, concerning Yandi and Huangdi, or XH-XD, two Chinese ledged emperors, belongs to the research category of the memory about them, starting quite long before its scientific name Yhxdology came into being. Yhxdology, the modern and the latest expression of the tradition memory about YH-XD, originated from the recall and study of the portraits and rites of YH-XD and matured with the course of Chinese economic reform. YH-XD, the iconic mnemonic symbol of Yhxdology, gave birth to kinds of texts and records, such as the legends, documents, historical sites and rites, which later become the objects of study. As an independent subject, Yhxdology deals with not only its definition, history, methodology, but also the accumulation of basic data, its symbolic monographs and its curriculum system settings.