Accurate performance model is particularly important for engine performance evaluation and fault diagnosis, and its accuracy mainly depends on the engine component characteristic map . These are proprietary information for the engine manufacturer and were obtained in expensive rig tests. However, due to the assembly size and manufacturing process errors of the same type of engine, there are some differences between individual engine components map, especially the change of compressor map. In this paper, a new method of generating compressor characteristic map is proposed. The speed characteristic curve is expressed by the general equation of the Bézier curve, and the parameters of the control points controlling the shape of the Bézier curves are expressed as a polynomial function of the dimensionless speed to complete the generating process of the speed characteristic curves on the compressor characteristic map. Finally, the engine test cell data are used to verify the established turbofan-engine performance model, and the influence of different control point parameters on the model accuracy is compared. The results show that this method can effectively improve the accuracy of the engine performance model.