Experimental investigation of shock-wave loading of ice (Larson, D. B. J. Glaciol. 1984, 30, 235) indicates a series of phase transitions in ice and gives evidence of the important role the kinetics plays in the process of dynamic phase transformations in ice. In order to model multiple phase changes in ice subjected to impulsive loading, thermodynamic equations of state of ices Ih, III, V, and VI and liquid water are used in the pressure range 0-2100 MPa and the temperature range 230-350 K. A kinetic model is presented that makes it possible to describe quantitatively a complex picture of the phase transitions in ice. The results of computer simulations of shock-wave loading of ice are consistent with the available experimental data.