Abstract: Objective To investigate the relation between slow blood flow phenomenon on coronary arteriogram and findings on dynamic electrocardiogram. Methods Forty-three patients with chest pain admitted to our hospital underwent coronary arteriography in January 2006-May 2009（CAG）,which showed slow blood flow phenomenon.Thirty patients with normal CAG served as controls.Dynamic electrocardiography was performed the day after coronary arteriography.The results were analyzed. Results Of the 43 patients,26（60.5%） showed depression in ST segment,32（67.4%） showed alterations in T wave,and 21（48.8%） showed frequent ventricular premature or non-sustained ventricular tachycardia.Frequent ventricular premature or non-sustained ventricular tachycardia was more frequent in patients with abnormal CAG than in those with normal CAG（P＜0.01）. Conclusion The number of blood vessels involved in coronary slow flow phenomenon is related with frequent ventricular premature or non-sustained ventricular tachycardia.