Objective To explore clinical feature and coronary artery lesion characteristics of non-ST-segment elevation myocardial infarction (NSTEMI).Methods Seventy-three patients of NSTEMI were studied,their clinical data and results of coronary angiography being analyzed.Results Risk factors of coronary artery disease among all the patients were 50(68%) with hypertension,26(35%) with diabetes,34(46%) with hyperlipidemia and 28(38%) with smoking history.There were 52(71%)with angina pectoris before this hospitalization,22(30.6%) with inhospatial angina pectoris,15(20.4%) with severe arrythmias,7(10.2%) with cardiac shock,3(4%) died.52(71%) were with ST-T depression and 21(29%) with normal ECG.Coronary angiography revealed 54(74%) with lesions in more than one vessel and 19(26%) in one vessel (P