For weakening the shock-wave/boundary layer interaction separation in the subsonic diffusion sector of ramjet inlet, a control method based on boundary layer stripping was presented. The boundary layer low speed flow was discharged from the inlet with adjustable partitions. The numerical investigation indicates that with the method, the shock-wave/boundary layer interaction separation is dramatically weakened and the end shock-wave chain becomes shorter even vanishes, which result in a marked increase of the anti-back pressure capability, a significant increase of the maximum total pressure recovery coefficient, and the exit flow field quality is obviously improved.