Abstract: To evaluate the clinical values of 64slice computed tomography angiography for coronary heart diseases based on conventional coronary artery angiography serving as the gold standard. MethodsThe results of 64slice CTA were compared with the results of CAG implemented in a recent twoweek period, and the different degrees of the coronary stenosis and pathological changes of different branches of coronary artery shown by 64slice CTA were assessed. ResultsIn 70 patients， 259 coronary arteries were evaluated with 107 lesions found by 64slice CTA. Among the lesions, 101 were diagnosed with CAG; 6 lesions were falsely positive and 8 other lesions were confirmed by CAG, which were not picked up by 64slice CTA. The sensitivity， specificity， positive predictive values and negative predictive values were 92.7%，96.5%，94.4% and 95.4% respectively for detection of the diseases. Conclusion64slice CTA has good sensitivity and specificity in detecting CAD，and it can also give a fairly accurate assessment for stenosis severity in most patients compared with CAG. Therefore，it is a useful noninvasive method for detecting coronary artery diseases.

Key words: Coronary disease, Tomography,XRay computed, Coronary angiography