Abstract: This paper summarizes professor XU Shoutian's experience in diagnosis and treatment of leukorrheal diseases， which believes that the main pathogenesis of leukorrheal diseases is conception vessel and belt vessel losing control due to the dampness lingering in the lower Jiao impairing conception vessel and belt vessel. And deficiency in nature and excess in superficiality are the pathogenesis features of leukorrheal diseases. The treatment takes eliminating dampness as the main method， and draining dampness as an assisting method. The treatment should be verified according to the ages. The main formula is modified Simiaosan.