As we know, there are changeable principles of treatment and prescriptions and herbs in Chinese medicine theory. We can summarize the complex principles as Xie and Zheng（vital qi and pathogenic qi. In clinical practice，it is considered that the treatment can be more simple with “supporting vital qi and dispelling pathogenic qi” for guidance. The Xie and Zheng（vital qi and pathogenic qi）was elaborated in Canon of Medicine while strengthening body resistance and eliminating pathogenic qi was carried out in Treatise on Exogenous Febrile Diseases, and the latter idea has been inherited in the later medical practitioners.