In this paper, the time-dependent numerical method has been used to solve the three dimensional Navier-Stokes equation, the numerical procedure uses Roe's flux difference splitting technigue and TVD scheme or LED scheme for the convective terms and central differencing scheme for viscous terms. Numerical solution of hypersonic laminar flow over a blunt biconic with attack angle is obtained.The resolution of shock, computational accuracy of viscous boundary layer and the efficiency of three schemes: Osher-Chakraverthy's TVD scheme, Harten's TVD scheme and Jameson's LED scheme, are investigated and compared by the numerical calculation of three dimensional hypersonic viscous flow.