Purpose : Endovascular repair (post-endovascular aneurysm repair, EVAR) is a common method for the treatment of abdominal aortic aneurysm (Abdominal aortic aneurysm, AAA). However, it is clinically found that if the tumor neck of the patient is seriously angled, the stent is more likely to be displaced after treatment. Therefore, the purpose of this study is to explore the effect of preoperative neck angle on stent displacement force and displacement after EVAR. Methods 28 patients with AAA were selected and divided into two groups according to the neck angle before operation: non-severe angle group (n = 14) and severe angle group (n = 14). According to the real CT images of the patients, the aneurysm model before operation, the aneurysm model followed up twice after operation and the stent graft model were established respectively. The preoperative tumor length (Lsac), maximum tumor diameter (Dmax), neck length, tumor volume and stent displacement were measured and compared. The hemodynamics of the first postoperative follow-up model was analyzed by the method of computational fluid dynamics. Results there were significant differences in tumor length, Dmax, displacement force, neck length and tumor volume between the two groups, but there was no significant difference in the center of gravity displacement and proximal displacement of the stent. In addition, there were 2 cases of internal leakage in the non-severe angular group and 4 cases in the severe angular group. Conclusion severe neck angulation can significantly increase the stent displacement force and decrease the proximal Anchorage zone. Therefore, doctors should strengthen the postoperative follow-up of patients with severe neck angulation and guard against the occurrence of long-term internal leakage.