Psoriasis is a chronic and an easily recurrent dermatosis, with the characteristic red papules and patches covered with silvery scales especially on the outer aspects of the limbs, scalp, and back.1 The cause of the disease is not clear yet, and no satisfactory therapies are available for the treatment so far. We treated 60 cases of psoriasis vulgaris by oral administration of Yin Xie Ping Granules (银屑平颗粒 Granulae for Treating Psoriasis) from August 2004 to March 2005 with quite good results, with another 60 cases treated by taking Xiao Yin Pian (消银片 Tablets for Relieving Psoriasis) as the controls.A report follows.