AbstractA set of macroscopic phonoriton equations describing exciton, photon, and LO‐phonon spectra renormalization in presence of intensive polariton wave is analyzed. New specific additional boundary conditions are introduced and corresponding exciton reflection spectra are calculated for the problem of probe wave reflection at the crystal boundary. The appearance of the new phonoriton spike and the exciton line shifting in reflection spectra are determined by the intensity of the pumping wave.