Objective: To compare inthe duration of study 3DDSA delay grasp the neck of the aneurysm, and peripheral blood for display differences. Methods: A retrospective analysis of 50 cases of intracranial aneurysms by conventional 2DDSA, 3DDSA diagnosis for small aneurysms (diameter <5mm) 21 Ge, medium-sized aneurysms (diameter 5--10mm) 9 Ge, large aneurysms (diameter 11 --25mm) 11 Ge and giant aneurysms (diameter> 25mm) 8 Ge. A total of 55 aneurysm neck visibility and display cases parent vessel were analyzed. Results: In the four types of aneurysm neck visibility and display cases contained tumor blood vessels, no statistically significant difference between the 3DDSA. 1.5-2s delay time when the small aneurysm neck and parent vessel showed good; the delay time was 2-3s, medium-sized aneurysm neck and parent vessel showed good; delay time is 3-4s, the large artery aneurysm aneurysm neck and parent vessel showed good; delay time is 4-5s, the giant aneurysm neck visibility and display good parent vessel. Conclusion: 3DDSA for different sizes of aneurysm should delay difference. When the aneurysm diameter is 10mm, 3D angiography delay time can be met 4-5S visibility and neck tumors contained tumor clearly show the blood vessels, for doctors to provide accurate images for easy diagnosis and surgery.Explore 3DDSA delay duration understand the impact of the neck of the aneurysm, and peripheral blood for display.Explore 3DDSA delay duration understand the impact of the neck of the aneurysm, and peripheral blood for display.