AIM:To investigate the causes and treatment methods of postoperative complications in congenital ptosis. METHODS: A total of 20 children(21 eyes) who requested reoperation after the correction of congenital ptosis from 2005 to 2010 were surveyed and treated,to observe the effect of surgical treatment.RESULTS: The causes of reoperation were entropion trichiasis (9 eyes),under-corrected ptosis(14 eyes),under-corrected ptosis and eyelid defect companion fistula formation (1 eye),unsatisfied shape of double eyelids (19 eyes).14 eyes were operated with frontal muscle flap’s suture adjustable. 1 eye was operated with frontal muscle flap suspention and fistula resection combined reconstruction of eyelid defect. 4 eyes were operated with frontal muscle flap suspention. 2 eyes were performed with frontal muscle flap reinforcement. Through the observation after operation for 0.5-1 year,the postoperative effects of all patients were satisfactory except lid lag more or less. CONCLUSION: The postoperative complications of ptosis are varied. There are never fixed pattern to treat complications. We should modify our surgical methods in accordance with specific conditions. The adequate preoperative examination and the choice of correct operation technique,improving surgical skills are the key points to reduce the postoperative complications. 