The aerodynamic characteristics of different types of civil aircrafts with turbofan engine air intake and exhaust were studied numerically by solving the Navier-Stokes equations based on mixed grids. The engine air intake face boundary conditions and jet exhaust boundary conditions were adopted to simulate the powered effects of the engine. The numerical methods were validated by the turbine powered simulator model. On this basis

the effects of engine air intake and exhaust were analyzed for the civil aircrafts with wing-mounted nacelles and back-mounted nacelles. The results indicate that the jet efffects of the engine play a major role in the lift characteristics of the wing-mounted civil aircraft. For the tail-suspended civil aircraft

the mass of air intake affects the wing aerodynamic characteristics directly and with the increase of air intake mass

the surface pressure coefficients on the upper surface of the wing are reduced and the location of the shock wave is shifted downstream. The mass of air intake also has great influence on the drag characteristics of different types of civil aircrafts. The aerodynamic interference between aircraft and engine must be valued highly in the aircraft design.