Objective To investigate the efficacy of endovascular repair and conservative treatment of Stanford type B aortic dissection. Methods A prospective randomized controlled study was carried out in 72 patients with Stanford type B aortic dissection in our hospital from June 2015 to June 2016. All patients were of no complications. Patients were randomly divided into conservative treatment group and endovascular treatment group (n = 36). Patients in conservative treatment received medication for hypertension and pain without any surgical interventions. Patients in endovascular group received endovascular repair of aortic dissection. The short-term and medium-term effect of treatment as well as occurrence of complications were recorded. Results Incidence of symptom relief in endovascular group was increased significantly compared with that in conservative treatment group (97.22% VS 75.00%, P < 0.05). No statistically significant difference in in-hospital mortality or cumulative survival was identified between the two groups (P > 0.05). Thrombosis rate of false lumen was increased while max diameter of false lumen was decreased obviously in endovascular treatment group compared with those in conservative treatment group (P < 0.05). Conclusions Endovascular treatment is superiror to conservative treatment for patients with aortic dissection , especially in aspect of symptom relief.