Abstract: Circular arc, flat plate and sharp cone were used as pro to types to investigate the effects of stream wise curvature and gradient on the stability of compressible boundary layers in the frame work of linear stability theory. The boundary layer pro files on the surface are calculated using the Cebeci-Keller box scheme. The stability equations are solved to determine the eigenvalues using a two-point fourth order accuracy finite difference scheme. It is show n that convex and concave curvature have different effects on the stability of the flow and the effect of favorable pressure g radient on stability is different for different bodied.