Dermatomyositis is one kind of systematic autoimmune diseases. The etiology and pathogenic mechanisms are still unknown. Corticosterodis are the main drugs for treatment of dermatomyositis today. Due to some overlapping clinical features between dermatomyositis and other connective tissue diseases, it may be difficult to diagnose people with dermatomyosits. Meanwhile, there were limited information about dematomyositis in Taiwan's journals and publications. This article was to review epidemiology, pathophysiology, classification, diagnosis, treatment, and nursing care of the Dermatomyositis. It is aiming at promoting nursing knowledge, providing nursing intervention properly, improving nursing professional ability and giving patients the best medical-mursing care.