Cardiac adversity is by far the commonest cause of mortality in patients with diabetes.to study angiographic extents, number of coronary vessels, and type of lesions(A, B, C)and comparison the findings between diabetic and nondiabetic patients. The study included all Syrian patients who underwent a cardiac catheterization from 8 March to 8 September 2022 at Tishreen University Hospital in Latakia. It included 455 patients; 181 of them were excluded(either normal coronary arteries or the fact that the patient had previously performed a Coronary Artery Bypass Graft). Results of this comparative study: Diabetic patients had more affected arteries(3arteries:39.6% in diabetic patients and 6.7%in nondiabetic patients, two arteries:35.3% in diabetic patients and 11.9% in non-diabetic patients, 4 arteries(including left main):5.8 % diabetic patients and 1.5% non-diabetic patients, single artery:16.5%in diabetic patients and 76.3% in nondiabetic patients. The anterior descending artery is the most affected artery, with 87.8% of the left circumflex artery and 69.8% of diabetic patients. Type of lesion: Type A:7.9%in diabetic and 47.4% in non-diabetic patients, type B:57.6%in diabetic and 38.5 %in non-diabetic patients.Type C:33.8%in diabetic and 10.4%in non-diabetic patients.