·AIM:To investigate the clinical factors inducing corneal injury after suspension of frontal muscle flap for congenital blepharoptosis in preschool children and to establish preventive measures.·METHORDS:Totally 94 preschool children(108 eyes)with congenital blepharoptosis were treated with suspension of frontal muscle flap.Bell phenomenon,angle eyelash,winking frequency,eyelid closure,fluorescent staining of the cornea and tear film break-up time(BUT)were observed pre-and post-operation.All the results were analyzed with statistical soft.·RESULTS:One week postoperatively,the rate of corneal injury was 10.2%,after 2 weeks all patients were cured.Early postoperative fluorescent staining of the cornea,blinking frequency and BUT compared with preoperation had statistically significant difference.There was no significant difference between preoperation and 2-week postoperation.·CONCLUSION:Suspension of frontal muscle flap is a kind of effective and safe measurement.The occurrence of corneal injury is mainly related with blepharophimosis,trichiasis,reduced blinking,Bell’s phenomenon disappearance and the tear film instability.·