AIM:To investigte the effective method to treat old iridocyclitis and glaucoma·METHODS:Thirty-eight patients(52 eyes) were randomly divided into two groups.Group A(17 cases,24 eyes) were treated with laser peripheral iridectomy.Group B(21 cases,28 eyes) were treated with trabeculectomy and Mitomycin C·RESULTS:Four eyes were cured in group A(17%).Twenty-six eyes were cured in group B(93%).After statistical analysis,there was significant difference between the two groups(P<0.01)·CONCLUSION:Trabeculectomy and Mitomycin C is an effective treatment of old iridocyclitis and glaucoma.