This paper aimed to evaluate the clinical application value of vitrectomy combined with intraocular drug injection on treatment of severe endophthalmitis. Retrospective analyzed the 28 eyes for the 28 cases of patients suffering severe endophthalmitis, and with treatment of pars plana vitrectomy combined with intraocular drug injection, and foreign matter removal surgery. This study also analyzed the whole body and local application of antibiotics data, and clinical data of corticosteroid drug treatment. This study had followed up 6 to 12 months, 28 intraocular infected eyes of the 28 cases all had got controlled. The vision of 26 eyes improved to some degree, 2 eyes had eyeball atrophy. vitrectomy combined with intraocular drug injection was the most effective method to treatment the suppurative endophthalmitis.