AIM:To study the clinical curative effect of conjunctival flap covering surgery in treatment of serious fungus corneal ulcer.METHODS:Thirteen patients(13 eyes)with serious fungus corneal ulcer who underwent conjunctival flap covering surgery were retrospectively analyzed,including 10 cases with traumatic corneal ulcer,3 cases of unknown causes.All the patients were treated with removal of the necrotic corneal tissue combined with conjunctival flap covering surgery.RESULTS:Postoperatively,the corneal ulcer in 12 eyes was cured after one surgery.1 case cured after treated again by conjunctival flap covering surgery after the conjunctival flap desquamated.The corneal ulcer was cured and the eyeballs were saved in 13 eyes by conjunctival flap covering surgery.CONCLUSION:Conjunctival flap covering surgery is effective and practical in treatment of serious fungus corneal ulcer which is not responded to medical therapy,and it is an effective method to control the fungus inflammation and save the eyeballs,which provide the further condition for corneal transplantation.