Objective To investigate the clinical character istics of contrast-induced nephropathy(CIN)in patients with coronary artery disease after they used contrast media.Methods 268 patients used contrast media were divided into normal coronary artery group and pathological coronary artery group according to the results of angiography.And the pathological coronary artery group were divided into lesion with single-vessel group,lesion with doublevessel group and lesion with multi-vessel(or left main vessel lesion)group.The 268 patients also were divided into 3 groups according to the dose of contrast media,low dose group,middle dose group and high dose group.Analyse the relativity of grade of coronary artery disease,dose of contrast media and level of serunl ereatinine(Scr)after determination the level of Scr.Results Scr didn't increase after received contrast media in normal coronary artery group,while increased in the pathological COronary artery group and the increase Was remarkable(P＜0.05).The morbidity of CIN in the pathological coronary artery group was up to 14.5%with statistical significance(P＜0.05)from 0%in the normal group.And the recovery of Scr was slow in pathological coronary artery group.The level of Scr was still high with statistical significance in the forth day after angiography(P＜0.05).The dosages of contrast media significandy affected on the Scr and the rate of CIN.The higher dose of contrast media,the higher rate of CIN.Conclusion The CIN could be caused in patients with coronary artery disease,the dosages of contrast media should be controlled strictly.