Abstract： Polycystic ovary syndrome （PCOS） is one of the most common endocrine and metabolic disorders in women of reproductive age. "Cold generating stagnation" refers to insufficiency of yang qi and the stagnation of qi circulation caused by insufficient yang energy or exposure to external or internal cold pathogens，leading to unsmoothed flow of qi，blood，and body fluids，and the formation of phlegm and blood stasis. Over time，these pathogenic factors may bind together and form "stagnation." The etiology and pathogenesis of PCOS are discussed in this article through the theory of "cold generating stagnation." It posits that PCOS originates from insufficient spleen-kidney yang qi as the underlying condition， with stagnation of cold qi as the initiating factor， ultimately leading to the formation of coldphlegm and blood stasis. This pathological progression results in impaired ovum development and blockage of the uterus. Based on this theory，the article explores therapeutic principles，formulas，and Chinese herbs for PCOS，aiming to provide a theoretical foundation and clinical guidance for traditional Chinese medicine management of PCOS.