“火逆”是指《伤寒论》中提到的火法用之不慎出现各种变证。与现代临床放疗与化疗作用于人体之后伤阴耗气、损阴伤津而表现出的阴伤火热证候存在诸多相似之处。临床上运用滋阴泻火方法治疗放化疗后出现的各症也取得了较好疗效。笔者着重探讨运用火逆理论指导非小细胞肺癌放化疗的意义。 “Fire inverse ” refers to the “Fire Treatise” mentioned in the fire method used inadvertently appear a variety of evidence. And modern clinical radiotherapy and chemotherapy on the human body after the injury of gas, loss of yin damage Jin injury showed the flawed syndrome there are many similarities. Clinical use of yin and purging fire treatment of radiotherapy and chemotherapy after the symptoms have also achieved good results. The author focuses on the use of fire inverse theory of non-small cell lung cancer radiotherapy and chemotherapy significance.