Abstract: A numerical study of different 2-D hypersonic airbreathing vehicle configurations under Mach 6 has been performed to analyze the aerodynamic characteristics,the airframe upper surface geometries considered in the present work include the Von Karman curve and straight line,the combustor configurations included the tandem backward facing step and tandem expansion straight line,the nozzle shapes included the power law curve and straight line.A second-order Roe scheme with a minmod limiter was used for space descretization,and Menter's k-ω SST(Shear stress transport) turbulence model was used for predicting the turbulence flows,the CFD-derived pressure and friction distributions were numerically integrated to compute the lift,drag and pitch moment,and the influence of each configuration design on the global aerodynamic characteristics have been analyzed,which provided assistance for the design of the hypersonic airbreathing vehicle.