Abstract: Objective: To observe the effect of treating blepharoptosis by simplex skin excision.Methods: The strength of levator palpebrae superioris muscle,the value of margin reflex distance（MRD） of upper eyelid and the degree of ptosis were measured pre-operation and post-operation in 21 patients aged more than 75 with blepharoptosis.The general appearance of both upper eyelids and the width of palpebral fissure was observed.Results: MRD value was（0.5±1.8） mm pre-operation and（2.8±0.9） mm post-operation,and the difference was significant（P＜0.05）.The width of palpebral fissure was increased markedly and symmetrical in both eyes.The visual field of patients was improved and the eyes could be closed naturally.Conclusion: The simplex skin excision can be considered one of ideal methods treating blepharoptosis,especially in patients aged more than 75.