AIM:To investigate the effect,safety and postoperation complications in the treatment of ciliary block glaucoma by transscleral cyclodiode laser photocoagulation. METHODS:It is a prospective study.Seven patients diagnosed ciliary block g’aucoma were given maximal dose anti-glaucoma medicines.But their intraocular pressure were still more than 30mmHg.Then they were treated by transscleral cyclodiode laser photocoagulation. RESULTS:Intraocular pressure and best-corrected visual acuity were compared between preoperation and postoperation after 1 intervention week Mean±SD intraocular pressure was reduced from 33.63±4.50mmHg pre-operatively to 15.88±3.21mmHg post-operatively; Mean±SD best-corrected visual acuity was increased from 0.16±0.11 preoperatively to 0.42±0.20 postoperatively. These two indexes were significantly different. All the patients’ anterior chamber were formed during 36 hours and one patient who had a small hyphema healed well. CONCLUSION:Transscleral cyclodiode laser photocoagulation appears to be an effective and safe treatment for ciliary block glaucoma.