Optical nutation belongs to phenomena of coherent interaction of light with matter. It represents a periodic change in the initial state of a system caused by the field of an electromagnetic wave, which leads to the corresponding modulation of radiation from a medium. Theoretical description of nutation is usually performed in the semiclassical approximation in which a medium is described quantum mechanically, while a field is described classically by means of Maxwell‘s equations. In this case, nutation consists in periodic conversion of excitons into photons and vice versa. Such transformations continue until the development of relaxation processes. The quantum coherent phenomenon of optical nutation on excitons can be directly observed by probing exciton states if the exciton dephasing time exceeds the nutation period. For low excitation levels of a medium within the region of linear crystal optics, the nutation frequency is determined by the exciton– photon interaction constant, i.e., independent of the wave field amplitude, whereas for high excitation levels, the nutation frequency begins to depend on the exciton density. It was shown that the nutation frequency can both increase and decrease with increasing excitation level. Note that there still has been no detailed study of the features of optical nutation and the nonlinear dependence of its frequency on the excitation level. In addition, it is of interest to study the possibility of phase control of nutation and the existence of selftrapping in the exciton spectral region. It was shown that the features of two photon nutation in a system of coherent biexcitons are determined not only by the excitation level but also by the initial phase difference of excitons and photons. Therefore, investigation of the development of optical nutation in the exciton spectral region at high excitation levels is of current interest. Consider optical nutation in a system of coherent photons and excitons in semiconductors caused by ultrashort resonance laser pulses. The pulse duration p is assumed to be much shorter than the exciton relaxation time rel . In this case, relaxation processes can be neglected because they have no time to operate during the laser pulse action. We assume that all photons and excitons in a crystal are coherent and have the same wave vectors, energies, polarizations, and phases. Nutation is considered at high excitation levels of the crystal, when nonlinear interaction processes in the system of excitons and photons should be taken into account. Under these conditions, the main nonlinearity is the inelastic exciton–exciton interaction. Therefore, we will consider optical nutation in the exciton spectral region taking into account exciton–photon and elastic exciton–exciton interactions. It has been shown that for nonzero initial exciton and photon densities, three regimes of the time evolution of excitons and photons take place:periodic conversion of excitons into photons and vice versa, aperiodic conversion of photons into excitons, and the rest regime. The oscillation amplitudes and periods of particle densities have been found, which are determined by the initial exciton and photon densities, the resonance detuning, the nonlinearity parameter, and the initial phase difference. The existence of exciton selftrapping and photon trapping in the system have been predicted, which appear for threshold values of the nonlinearity parameter. As this parameter increases, the oscillation amplitude of the exciton and photon densities sharply changes. Both these effects are caused by the elastic exciton-exciton interaction, which leads to the dynamic concentration shift of the exciton level.