AimTo research the affect factors and the solutions for diagnosis of coronary stenosis with arteriosclerosis plaques that were divided into two categories (the non-calcified plaques and calcified plaques) with 320-slices computed tomography angiography (CTA) compared with tocoronary angiography (CAG).Methods396 coronary arteriosclerosis plaque lesions were found in 102 patients examed by CTA and CAG.They were divided into five groups according to vascular stenosis degree: normal, mild, moderate, severe and occlusion.The coincidence rate of vascular stenosis degree by CTA were calculated compared with CAG with lesions divided into two categories (the non-calcified plaques and calcified plaques).The calcium threshold for calcified plaques is set in four different programmes: ＞150 HU, ＞250 HU, ＞350 HU, ＞600 HU.ResultsCTA shows the 396 arteriosclerosis plaques with 68.2% for calcified plaques and 31.8% for non-calcified plaques, and 6% is unstable plaques, 7.8% without vascular stenosis.It is the same as calcium threshold in groups of ＞150 HU, ＞250 HU, ＞350 HU for the coincidence rate of vascular stenosis degree comparing CTA with CAG but lower in group of ＞600 HU.The coincidence rate comparing CTA with CAG of is