The author demonstrates the consistency of polycystic ovary syndrome(PCOS)and dorsal furuncle from the pathological attributes,core pathogenesis,follow-up pathogenesis,clinical manifestations and modern research,proposes that PCOS can be treated from dorsal furuncle.The pathogenesis of PCOS is considered to be kidney deficiency and blood stasis and qi-blood deficiency with frequently liver depression,spleen deficiency and phlegm.Thus it should be treated with the method of “mainly invigorating kidney,invigorating spleen and dispersing stagnated liver qi; focusing on warming yang,promoting blood circulation and removing blood stasis.We should not focus on eliminating blood stasis and eliminating phlegm slightly,warming the kidney and forgetting soothing the liver,neglecting the pathogenic effect of stagnation of the liver and phlegm.