AIM:To explore the causes of dacryocystorhinostomy failure and the clinical therapeutic effects of reoperation.METHODS:Seventeen cases (17 eyes) with failure dacryocystorhinostomy were reoperated. The causes of the first operation failure were analyzed,and the reoperation skills and effects were explored.RESULTS:Patients were followed up from 4 to 12 months. All reoperations were successful. The main reason of failure was small bone hole and improper location,dacryocyst not fully incised, lower end of blind pouch and contact adhesion of anterior flap with posterior flap.CONCLUSION:Mastering the surgical skills and key points, correctly dealing with the problems of the first operation, the reoperation will be successful.