Objective:To explore the coronary angiographic (CAG)characteristics of young male patients With type 2 diabetes mellitus (T2DM)and coronary heart disease (CHD).Methods:Clinical data of 233 young male CHD inpa-tients,Who Were confirmed by CAG and admitted in Beijing Shunyi Hospital from Jan 2011 to Jan 2013,Were retro-spectively analyzed.According to suffering from T2DM or not,they Were divided into T2DM + CHD group (n=71)and pure CHD group (n=162),baseline data and CAG results Were compared betWeen tWo groups.Results:Compared With pure CHD patients,there Were significant rise in levels of total cholesterol [TC,(4.11 ± 0.26) mmol/L vs.(5.79±0.37)mmol/L],loW density lipoprotein cholesterol [LDL-C,(2.31±0.32)mmol/L vs.(3.91 ±0.45)mmol/L],triglyceride [TG,(1.60±0.25)mmol/L vs.(3.28±0.56)mmol/L],P<0.01 all;CAG indi-cated that there Were significant increase in percentages of multi-vessel coronary disease (15.4% vs.35.2%),seg-mental lesion (13.6% vs.35.2%)and diffused lesion (31.5% vs.57.7%),and significant reduction in percentage of collateral circulation (50.6% vs.29.6%)in T2DM + CHD patients,P<0.01 all.Conclusion:There are more multi-vessel lesions,diffused lesion and less coronary collateral circulation in young male patients With type 2 diabe-tes mellitus complicated coronary heart disease.