Objective To analyze the clinical diagnostic value of three-dimensional CT angiography(CTA)in patients with intracranial aneurysms. Methods A retrospective analysis in January 2013 to March 2016,after confirmed the clinical data of 21 patients with intracranial aneurysms, all patients were performed 3 d CTA and digital subtraction angiography(DSA)inspection,compared to two kinds of checking methods for the diagnosis of intracranial aneurysm effect, and analyze the three-dimensional display of CTA for intracranial aneurysm lesions. Results Compared with the final diagnosis,the diagnostic accuracy of three-dimensional CTA for intracranial aneurysms was 93.33%, the sensitivity was 96.55%and the positive predictive value was 96.55%. The diagnostic accuracy of DSA for intracranial aneurysms was 93.10%, the sensitivity was 100.00%, and the positive predictive value was 93.10%. There was no significant difference between the two groups(P BBB 0.05). Three-dimensional CTA has a better effect than DSA on the aneurysm and tumor of aneurysm.Three-dimensional CTA can observe the three-dimensional structure of aneurysms,and clearly show the anatomical structure of the tumor artery and the operative area. Conclusion 3 d CTA for intracranial aneurysm has the clinical diagnostic value of DSA,and surgical diagnosis coincidence rate is high,the display effect is superior to DSA for intracranial aneurysm lesion,can be used as one of the first choice for the intracranial aneurysms diagnosis method.