AIM:To study the characteristic of vitreoretinal pathology and evaluate the effectiveness of vitrectomy for Terson syndrome. METHODS:Nine patients ( 12 eyes ) with Terson syndrome underwent vitrectomy. The clinical characteristic and the effectiveness of those cases after vitrectomy were analysed. RESULTS:Postoperatively,most vitreous cavities of 12 eyes were clear; the visual acuity of all patients increased more than two lines than before. All cases had no serious complication when followed up. CONCLUSION:Vitrectomy is a safe and effective method for treating Terson syndrome, which can rapidly improve vision of patients.