AIM:To study the causes and treatment of secondary glaucoma after silicone oil tamponade.METHODS:Retrospective analysis was done in 97 eyes which underwent silicone oil tamponade.RESULTS:Secondary intraocular hypertension occurred in 39 eyes(40%),and 12 eyes(12%) occurred in two weeks,8 eyes(8%) occurred in the second to eighth week,19 eyes(20%) over eight weeks;Most eyes recoverred well through medicine or operation.CONCLUSION:Secondary intraocular hypertension is one of the common complications after silicone oil tamponade.Inflammatory reaction,over silicon oil,silicon oil going into the anterior chamber,and silicon oil emulsifying are the main causes of intraocular hypertension.Intraocular hypertension is more often in introcular lens or aphakic eyes.Medicine and operation are effective treatments.