AIM: To analyze the factors and prognosis of delayed choroidal hemorrhage after glaucoma surgery.METHODS: Analysis of the cases of delayed choroidal hemorrhage after glaucoma surgery happened in our hospital during April 2003 to December 2009.RESULTS: There were 9 cases(9 eyes) of delayed suprachoroidal hemorrhage, 2 cases with high myopia, 3 cases with infantile glaucoma, 2 cases with complex glaucoma combined anterior chamber intraocular lens removal surgery, 1 case without vitreous body, another elder case with systemic vascular disease. It was all happened in 1-7 days after trabeculectomy. They were all treated with drug therapy at the early stage, 1 case accepted surgery at postoperative 11 days and the suprachoroidal hemorrhage was successfully drainaged. Other 8 cases with hemorrhage were spontaneously absorbed. After the follow-up of 14 months, no eyeball atrophy was reported and visual acuities were no significant change except 1 case of 1.0, the other 3 cases of infant can''t act in concert with examination. Intraocular pressure increased again in 4 cases at 1-12 month.CONCLUSION:Risk factors for delayed suprachoroidal hemorrhage may include prolonged high intraocular pressure before surgery, intraocular pressure suddenly dropped intraoperatively, sustained low intraocular pressure, eyes with no vitreous body, excessive myopia, complicated glaucoma, infantile glaucoma. Delayed suprachoroidal hemorrhage can firstly treated by medicine. If the hemorrhage still can not be absorbed, surgery of drainaging suprachoroidal hemorrhage can be considered to improve the prognosis.