A four-month-old male infant underwent sub-Tenon's steroid irrigation for treatment of orbital capilary hemangioma that was causing exposure keratopathy risk to the left eye from progressive proptosis. The temporal inferior sub-Tenon's space was irrigated with a mixture of triamcinolone acetonide (40 mg/ml) and betamethasone sodium phosphate (6 mg/ml) by a blunt-tipped sub-Tenon's cannula. We describe this procedure as irrigation because reflux of the mixture from the incision was permitted. Two weeks after treatment, a marked reduction of proptosis was noted. One month after treatment, the volume of the intraorbital hemangioma resolved significantly in MRI examination.