Objective To discuss the application of dualsource CT angiography with Stellar photon detector in the postoperative reexamination of lower limb artery stent implantation.Methods Retrospective analysis was performed on patients underwent stent implantation of lower limb artery and follow-up of CT angiography in xianning central hospital from May 2013 to December 2018. Multiple postprocessing techniques were used for vascular and stent reconstruction. Two doctors with senior professional titles independently evaluated the image quality. Compared the image quality, radiation dose and inspection time of the ordinary spiral CT and the dualsource CT with Stellar photon detector. Combined with DSA, the sensitivity, specificity, and accuracy of the dualsource CT with Stellar photon detector in the diagnosis of stent restenosis were evaluated.Results The independent scores of 103 stent reconstruction images by the two doctors were (4.59±0.57、4.62±0.54), with good consistency (ICC=0.886). Compared with ordinary spiral CT, the image quality score of photon dualsource CT showed no significant statistical difference (P＞0.05), but the radiation dose and inspection time had obvious advantages (4262.35 mGy/cm vs. 2341.81mGy/cm, 31.85s vs. 18.91s). Compared with DSA, the results of the 58 patients (69 stents) showed good consistency (Kappa=0.83), and the sensitivity, specificity, positive predictive value, negative predictive value and accuracy of photon dualsource CT in diagnosis of stent restenosis were 9615%, 94.12%, 98.04%, 88.89%, and 95.65%. Conclusion The dualource CT angiography with Stellar photon detector is safe, noninvasive, and can clearly show the image of lower limb arteries and stents. It has high sensitivity, specificity, and accuracy in the diagnosis of stent restenosis, and can reduce the radiation dose of patients and shorten the examination time, which has good clinical application value.