The purpose of this paper is to sort out and summarize the clinical cases of Professor YANG Jin, a renowned veteran Chinese medicine professor, and to inherit the thought of Professor YANG Shizhi, and to summarize Professor YANG Jin's theoretical basis, treatment ideas, and characteristics of prescriptions and medicines for treating stomach diseases from the perspective of liver to the thieves of five Zang-organs, so as to YANG Shi knows that liver is the thieves of the five Zang organs, which has an important influence on the treatment of gastric diseases. In addition to soothing the liver, nourishing the liver and calming the liver, he often pays attention to emotional dredging, making patients empathic, assisting psychological counseling, eliminating patients'ideological burden and achieving good results in every treatment.