Abstract: In this paper, the slip boundary conditions with wall injection are discussed. From analysis of mass, momentum and energy flux balance equations at inner and outer edges of the Knudsen layer using the Chapman Enskog velocity distribution function, the system of slip boundary equations with wall injection and catalysis in a multicomponent gas mixture is derived in a general form. Numerical calculations are made for a hypersonic flow passing the stagnation region of a blunt body by using the Viscous Shock La...