Introduction: The purpose of this case is to demonstrate one-step surgical management of mechanical blepharoptosis after upper eyelid tumor excision. Case Report: A 37-year-old man presented with right ptosis secondary to mass in the right upper eyelid. We performed debulking of the tumor mass, pathological examination, and a reconstruction of the upper eyelid. The upper eyelid reconstruction was performed by doing transverse skin resection of the upper eyelid and lateral canthal attachment of both upper and lower tarsal plates to the periosteum. Two weeks after surgery, his right eye was comparable to left eye, with neither lagophthalmus nor trichiasis with marked improvement in cosmetic appearance. Conclusion: The repair of blepharoptosis is a very challenging. Correct diagnosis, planning, as well as understanding of eyelid anatomy, experience, and good surgical technique are essential for this oculoplastic surgical procedure. In this case, the palpebral reconstruction was done in one-step procedure, using the contralateral eye as model, given excellent surgical outcome. Postoperatively, the patient's appearance and social interaction improved markedly.