Under the assumption of perfect gas，the thin layer N-S equations are solved by alternating direction implicit NND scheme，and the space grids of complex wing-shape are generated by solving parabolic partial differential equations. Finally，the numerical simulation results of maneuvering missile with the control helm are shown under the conditions:M_∞=7.3，α=20°.The results include contours of flow-field, pressure distribution and limiting streamline along the surface.