Since the main contents of the Huang di nei jing (Yellow Emperor's Inner Canon) was completed in the Warring States, in the form of questions and answers between Huang Di and Qi Bo, Qi - Huang is used as the appellation for Yellow Emperor's Inner Canon in later generation. As the Yellow Emperor's Inner Canon laid the foundation for the development of traditional Chinese medicine (TCM), in the Song Dynasty, Qi Bo and Huang Di was jointly called Qi - Huang for the first time in Bian que xin shu (Medical Understanding of Bian Que) by Dou Cai. And they were also worshipped as the orthodox ancestors of medicine in the shrine with new implication. Since then, Qi - Huang had an extended meanings for orthodox TCM or TCM science. However, in most cases, Qi - Huang was the appellation of TCM and TCM science. Meanwhile, new words derived from Qi - Huang have their respective meanings, such as "the art of Qi - Huang" and "the theoretical principles of Qi - Huang" standing for the science of TCM or the art of healing, and the theoretical principles. As for the "Qi - Huang physicians", it represents the TCM doctors and specialists. Dan xi shou jing (Medical Mirror of Danxi) by Wu Shangmo in the Ming Dynasty says that "meeting Qi - Huang specialists". "Qi - Huang books" means TCM books. And Qi - Huang profession refers to TCM profession, etc. It can be seen that the term Qi - Huang does have a rich content of Chinese traditional culture.