Objective Since the current model reconstruction and repair method for damaged blades is mainly the traditional method of additive manufacturing laser weld filling a new model reconstruction and repair method for damaged blades with subtractive manufacturing grinding and milling was proposed and the model reconstruction problem was transformed into an optimization problem. Methods Firstly the damage region of the blade was delineated and the corresponding damage cross-section lines of the damage region were derived. Secondly the damage model was aligned with the theoretical model and the theoretical profile lines of the theoretical model corresponding to the damage cross-section lines of the damage model were output. The objective function was modeled and solved using a curve interpolation reconstruction method combining NURBS and aerodynamics so that the theoretical profile lines can be smoothly connected with the undamaged profile lines of the damage model. Finally the reconstructed model was obtained by lofting and modeling each layer of the reconstructed and repaired cross-section lines with other undamaged cross-section lines and simulated hydrodynamics verification was carried out. Results The experimental results showed that the lifting force of the damaged blade after reconstruction and repair was improved by about 1. 5% which indicated that the reconstruction and repair method of the damaged blade surface applicable to the material reduction manufacturing could be useful for the repair. In addition other parameters such as velocity and turbulent kinetic energy were also improved to some extent and the pressure distribution was reduced to some extent. The images showed that the velocity and turbulent kinetic energy were mainly concentrated at the leading and trailing edges of the blade while the pressure was mainly focused at the leading edge that contacted the incoming air first which provided the lifting force for the blade. Conclusion From the perspective of subtractive manufacturing a blade model reconstruction method considering both NURBS and aerodynamics is proposed. It is experimentally proved that NURBS curves and reconstructed repair models with better fluid properties can be obtained which is of certain significance for the comprehensive development of damaged blade repair.