Abstract: The electromyographic manifestaions of 43 patients with connective tissue disease are analysed.It was found that in the patients with systemic lupus erythematosus(SLE)and dermatomyositis(DM) besides myogenic patterm neurogenic and mixed patterns of EMG were not rare.It demonstrated that before the onset of clinical symptoms of nervous system,there might be abnormal EMG in part,of the patients with SLE and DM.Tlie result suggests that EMG may be useful in the early detection of nervous lesions and the clinical diagnosis of connective tissue diseases.