Abstract: For fast and automatic calculation of aerodynamic in conceptual design and optimization design of hypersonic vehicles, an aerodynamic fast calculation program based on C/C++ is written in this paper. The program is used to calculate the aerodynamic performance of the HL-20 and double ellipsoid model, and the calculation results are compared with the wind tunnel experimental data. The results show that the calculation results are in good agreement with the experiment. The program can accurately predict the lift and drag characteristics of hypersonic vehicles. By modifying the engineering estimation method, comparing the calculated data, verifying the accuracy of the calculation method used in this paper, it also shows that the program can flexibly select the characteristics of the appropriate estimation method. The program can not only easily replace the estimation method, but also can be linked to the optimization program as a C++ library file to realize the conceptual design and optimization design of the hypersonic vehicle.