Abstract: OBJECTIVE To observe the clinical effect of Sanhuang Tang in the treatment of polycystic ovary syndrome (PCOS) of phlegm dampness heat accumulation type. METHODS Sixty-five PCOS patients of phlegm dampness heat accumulation type were randomly divided into the Chinese medicine plus group and the western medicine control group. Both group were taking metformin orally， on the basis of this the Chinese medicine group was also taking Sanhuang Tang granules orally. The clinical effect was observed for three months. Clinical symptoms， sex hormone levels， body mass and insulin resistance metabolic indexes were analyzed before and after the treatment. RESULTS The improvements of clinical symptoms， sex hormone levels， body mass and insulin resistance indexes in the Chinese medicine plus group were better than those in the control group (P<0.05～0.01).CONCLUSIONS The clinical effect of Sanhuang Tang plus group is better than that of the western medicine alone control group.