Emphasizing the correspondence between western medicine pathology and traditional Chinese medicine pathogenesis， ZHANG Cigong proposes “dual diagnosis and single treatment”. “Dual diagnosis” refers to the determination of pathology， etiology and disease names in western medicine as well as the syndromes of traditional Chinese medicine （TCM）， while “single treament” is the use of Chinese herbal medicine （CHM）. By analyzing the records of gastric disease cases by ZHANG Cigong and the related discussions， this paper summarized the “dual diagnosis and single treatment” of gastric disease， including the three-step diagnosis logic of gastric disease， the correspondence between pathology and pathogenesis， etiological diagnosis and TCM syndrome differentiation， as well as CHM for the treatment of acute gastritis， gastric ulcer and hyperacidity， duodenal ulcer， chronic gastritis， dyspepsia and gastrointestinal neurosis， and upper gastrointestinal bleeding. Under the thinking mode of organic integration of logical thinking， clinical practice， and scientific research， he corresponded the basic concepts of “

Qi

and blood， cold and hot， warm and cool” to “substance and function” in traditional Chinese and western medicine， exploring the essence of interoperability between Chinese and Western medicine， thereby expanding the scope of TCM syndrome differentiation and its efficacy to the microscopic physiological and pathological level. It is believed that ZHANG Cigong's academic ideas provide reference to the “win-win” approach of modern integration between Chinese and western medicine， and should follow the premise of learning from each other's strengths and complementing each other to fully highlight their advantages.