Abstract：The theory of "close correlation between the kidney and the stomach" originated from Huang Di Nei Jing （The Yellow Emperor’s Inner Classic）. The debate over whether the stomach or the kidney serves as the "gatekeeper" has lasted for thousands of years， reflecting the "contention of a hundred schools of thought" among physicians of successive dynasties regarding the theoretical understanding of the relationship between the stomach and the kidney. By tracing the origin of the "close correlation between the kidney and the stomach" theory and combining physicians' inheritance and innovation of this theory，it is found that the kidney and stomach are closely related to women's ovarian reserve function. The stomach and kidney not only participate in the metabolism of body fluids but also have a close connection in the source and transformation of essential qi. physicians over the ages mostly treats diminished ovarian reserve from the perspective of "depletion and deficiency of kidney essence and disorder of the thoroughfare and conception vessels". However，clinical effect is often limited by "failure to tolerate tonification due to deficiency" and pathological complexity. Based on the theory of "kidney as the gatekeeper of the stomach"， this article proposes the treatment principle of "simultaneous treatment of the spleen and kidney". The etiology and pathogenesis of diminished ovarian reserve are attributed to the dysfunction of the stomach as a gatekeeper， the spleen's failure to transport and transform，insufficiency of kidney essence production，and inadequate nourishment of the uterus. It is believed that the normal function of the spleen and stomach is a prerequisite for the replenishment of kidney essence. Regulating the descent of stomach qi can activate the kidney's gatekeeping function； meanwhile， strengthening psychological counseling can effectively delay the progression of the disease. Dynamic modification based on the patient's constitutional characteristics is also recommended，aiming to provide a new theoretical and practical perspective for the clinical treatment of diminished ovarian reserve.