AIM:To observe and evaluate the effect and possibility of operation of strengthening lateral tarsal strip and advancing lower eyelid retractor to treat senile entropion. METHODS: Senile entropion was caused by three different pathological mechanisms: loss of lid laxity, loss of tension of lower lid retractors and alterations to the musculus orbicularis. These can be corrected with the procedures developed by strengthening lateral tarsal strip and advancing lower eyelid retractor. The surgeon should be careful to avoid an overcorrection with iatrogenic ectropion。RESULTS:Thirty-one eyes (19 patients) with senile entropion were operated strengthening lateral tarsal strip and advancing lower eyelid retractor. After a mean follow-up of 8-50 months, the effects were satisfactory.CONCLUSION: Operation of strengthening lateral tarsal strip and advancing lower eyelid retractor is effective for treating senile entropion. 