Abstract: Combining with the viewpoints of the past doctors， this paper discusses the addition and subtraction of Xiaoqinglonng Decoction in the Treatise on Febrile Diseases， which "Removing Ephedra for asthma" is "in accordance with the meaning of ZHANG Zhongjing". And combing the relevant provisions in the Essentials from the Golden Cabinet to carry out a theoretical analysis and believes that it is excessively pursued and has no practical significance. According to Zhongjing's spirit of differentiation and treatment syndrome， Xiaoqinglong Decoction needs to distinguish between healthy qi and pathogenic qi relationship in specific clinical application. It can be used for patients with cold and good constitution， suitable for sweat method; if the patients with fluid retention and asthma， mild cold-exterior or accompanied with deficiency syndrome， it should not be used.