Objectives To evaluate the relationship of renal dysfunction,coronary heart disease and percutaneous coronary intervention(PCI).Methods(l)The subjects:There were 376 patients who come from department of cardiology of our hospital in this study undergoing coronary angiography.The patients were divided into two groups? according to coronary angiography:coronary artery disease(group A,n =263),in which 141 patients with renal dysfunction(group A1) and 122 patients with normal renal function(group A2):patients with other kinds of cardiovascular disease but normal coronary angiography(group B.n=113).Before the coronary angiography, all patients were measured the serum creatinine, microalbuminuria,fasting blood-glucose,triglycerides,total cholesterol,high density lipoprotein,low density lipoprotein, blood pressure in fasting 12 hours.(2)The diagnostic criteria for renal dysfunction:male serum creatinine>115 umol/L and/or microalbuminuria>30 mg,female>107 umol/L and/ or>30 mg.Results(1)The differences of renal function indexes in the group A and B:The mean level of microalbuminuria and serum creatinine was higher significantly in group A than that of the group B(43.48±38.93 vs.11.23±7.07 and 101.52±37.22 vs.80.62±17.4 respectively.Conclusions The coronary heart disease patients with renal dysfunction had more severe coronary artery stenosis,The renal dysfunction is a strong and independent risk factors for the coronary heart disease and beeds more revascularization therapy.