本文对37例多发性肌炎(PM)、皮肌炎(DM)住院病人临床资料及随访后分析认为:临床上具有近端肌乏力加肌活检证实或加血清酶、肌电图、典型皮疹即可诊断,近端肌乏力加后三项中任何一项或24小时尿肌酸测定增高及其它临床症状提示本病可能.血清酶在本病急性期增高,随病情缓解而下降,再度升高预示治疗无效或复发.PM、DM 预后一般较好,如合并SLE、内脏损害、感染或癌,则预后恶劣。对40岁以上患者尤加警惕. In this paper, 37 cases of polymyositis (PM), dermatomyositis (DM) hospitalized patients clinical data and follow-up analysis concluded that: clinically with proximal muscular dystrophy plus biopsy confirmed or plus serum enzymes, EMG, a typical rash You can diagnose, the proximal end muscle weakness plus any one of the three or 24-hour urine creatine determination increased and other clinical symptoms may prompt the disease.Serum enzyme increased in the acute stage of the disease, with the disease to alleviate and decline again rose High prediction of ineffective treatment or relapse.PM, DM prognosis is generally better, such as the merger of SLE, visceral damage, infection or cancer, the prognosis is poor. Especially for patients over 40 years old vigilance.