Spleen and stomach diseases are common clinical diseases.Mr.Zhang Zhenyu summarized the theories of previous medical experts regarding the physiological functions and pathological characteristics of the spleen and stomach，and combined it with his own clinical experience to form his own academic ideas.Mr.Zhang believed that spleen and stomach diseases are characterized by asthenia in origin and sthenia in superficiality and deficiency-excess in complexity，with the disease site located in the spleen and stomach and closely related to the liver.He advocated for mobilizing and stimulating the body's inherent healing ability to treat diseases.In the treatment of spleen and stomach diseases，it is necessary to treat both the root cause and the symptoms，pay attention to the ascending and descending of the spleen and stomach qi，treat the spleen by regulating the liver，and prescribe small doses of medicine with a broad therapeutic effect.For specific diseases，he advocated for combining disease differentiation with syndrome differentiation，and modifying prescriptions based on syndrome differentiation on the basis of basic formulas.