Objective To study the estimated values of CT angiography (CTA) in incomplete clipping after intracerebral aneurysm surgery. Methods 45 cases of patients with intracranial aneurysms treated with neurosurgical clipping in our hospital from December 2015 to November 2017 were collected and were given the CTA examination after operation. The clinical values of CTA in evaluating incomplete clipping after intracerebral aneurysm surgery were analyzed. Results All patients were given CTA return visit at 7-15d for after operation, and 1 case was found with 1 new aneurysm. There were 2 cases with incomplete clipping and reoperation was given to adjust the position of the tumor clip. 5 cases of hydrocephalus were found and treated with ventriculoperitoneal shunt. Except for 1 case with poor image quality of reading results, the rest could clearly show the relationship between the parent artery and aneurysm clips, the number and location of artery clip, whether the parent artery was smooth or not, aneurysm neck residual, cerebral vasospasm and other information. Patients were back to hospital for return visit at 3 months after operation, and all showed good intracranial condition. Conclusion CTA examination has the characteristics of non-invasive, short examination time and low cost. It can accurately display intracranial vascular and cerebral parenchyma after aneurysm clipping, and has high application values after clipping of intracranial aneurysms.