Abstract: This article reports an analysis of 135 cases of dermatomyositis admitted in the past 32 years, The male to female ratio was 1:1.2.129 cases, were adults, of whom the age affected was between 21~50 years old, this accounted for 69.63% of total number of cases. The initial symptom presented skin rashes in 70.54% of total cases. The morphology of skin rashes was polymorphous. The muscles of proximal part of extremities involved most commonly, this amounted to 70% of total number of affected muscles. The different muscles groups involved produced different symptoms, Besides, fever might be present. Heart, lung, kidney, Bast ro-intestinal tract, joint, epe etc, could be affected also in various degree.