The key of the computational accuracy, when calculating the aerodynamics of hypersonic by engineering methods, is the strategy for grid generation and the option of engineering methods. In this paper, a utility and easy-to-use method of grid generation is used, which allows each component of the model to use different computational method respectively; two order shock expansion method based on the approximate streamline fitting for many kinds of components with higher accuracy and less dependence on the experience of users is first introduced; when adding shock angle calculation in the two order shock expansion method, shock position of the model can be predicted; Spalding-Chi method based on initial surface element correct can supply more accurate viscous force coefficient compared with temperature reference method. The four cases indicate that, present methods have more accurate solutions when calculating aerodynamics of hypersonic, which can be used for preliminary design of hypersonic aircraft.