Engine blades work at high temperature， high pressure and high speed for a long time. Foreign bodies enter during the working process， and inevitably damage occurs. For the repair of damaged surface at the edge of curved and twisted blades， this paper adopts the allocation criterion based on the intact section line of intact blade in the adjacent undamaged area and the intact part of the blade section line in the damaged area to obtain the point cloud feature of the blade section line at the damaged edge and realize the regeneration and reconstruction of damaged surface. At the same time， the iterative closest point （ICP） registration algorithm is used to overcome the shortcoming of searching the nearest point set for a long time. The closest point pair search method based on auxiliary circular neighborhood is proposed to reduce the registration time cost. Finally， the smoothness of the damaged surface is analyzed to verify the feasibility of the method proposed in this paper.