[en] The influence of phase transformation in nuclear matter on a shock wave propagation in colliding nuclei is investigated. The qualitative consideration is based on nonrelativistic hydrodynamic approach. Thermal production of particles is also ignored. The model of phase transformation related to the pion condensation theory was used, but the results are of general significance. It is shown, that when the equation of state has the Van der Waals form, the splitting of the shock wave into the two ones should take place in the certain region of energy of colliding nuclei. In the first shock wave the density jumps from the normal nuclear density to the critical density of pion condensation nsub(c) and in the second one from nsub(c) to the density of superdence phase. With the ion energy being increased, the velocity of the second shock front in the lab system increases from zero to the velocity of the first front, which does not change. If such a splitting really occurs, one can observe it in the angular and energy distributions of reaction products of light ion collission with heavy target nucleus. If the experimental discovery of the maximum at about π/2 in angular distribution is confirmed, they must be interpreted as a result of the second shock wave generation. It is noted that the nonmonotonous behaviour of the shock front velocity, suggested by W. Greiner contradicts to the condition of the hydrodynamical stability and therefore cannot take place