Abstract: In order to improve the machining precision and efficiency of the turbine blades, the proposed control algorithm based on improved particle swarm Turbine high precision blades. In the control algorithm, the first to take advantage of different curvature of NURBS curve fitting of the turbine blade section line, and then be constructed geometric model of the turbine blades; then take advantage of the improved particle swarm algorithm to adjust the output parameters of the the redundant error of interpolation algorithm turn on the input of the control parameters of the high--precision machining of steam turbine blades iterative optimization; Finally NURBS curves constructed entity turbine blade model experimental simulation. Simulation results show that the algorithm enables the processing quality of the steam turbine blade is more uniform, and the flexibility to adjust the feed speed, thereby improving processing efficiency.