  In this paper, we study the zero-viscosity limit of the compressible
Navier-Stokes equations in a half-space with non-slip boundary condition. We
justify the Prandtl boundary layer expansion for the analytic data: the
compressible Navier-Stokes equations can be approximated by the compressible
Euler equations away from the boundary, and by the compressible Prandtl
equation near the boundary.
