Aim To investigate the diagnostic value of dual-source CT prospective electrocardiographic gated low dose scan technology(DSCT) for patients with chest pain after percutaneous coronary intervention(PCI). Methods 84 patients with chest pain following PCI underwent DSCT from July 2014 to June 2015 in our hospital. Two independent experienced radiologists evaluated the image quality, and the images were target reconstructed on coronary arteries. All patients underwent coronary angiography(CAG) within 2 weeks after DSCT scan. CAG results were as the “gold standard”, and the specificity, sensitivity, negative predictive value and positive predictive value of DSCT were assessed for diagnosing coronary artery stenosis in patients with chest pain after PCI. Kappa test was used for comparison between DSCT and CAG in diagnosis consistency of coronary artery stenosis degree. Results The specificity, sensitivity, negative predictive value and positive predictive value of DSCT for diagnosing coronary artery stenosis were 85.5%, 96.6%, 94.6%, 90.4%. DSCT and CAG were highly consistent in the diagnosis of coronary artery stenosis degree(Kappa value＝0.858). The effective radiation dose of DSCT was 4.67±0.87 mSv. Conclusions DSCT coronary angiography is able to obtain high quality images in patients with chest pain after PCI. It is accurate to evaluate the degree of coronary artery stenosis, radiation dose is low, and it is worthy of clinical spread.