Objective: To investigate the effects of cyclic antidepressants on ECG of patients in the treatment of depression.Method: 200 patients with depression were selected as the drug taking group and another 100 normal persons as the nondrug group. All were checked electrocardiogram( ECG) more than once. ECG of the two group was compared. Results: The abnormal rate of ECG caused by cyclic antidepressants was 39. 5%,which was related to the dose. The large dose of cyclic antidepressants led to obvious change of EC...