The book outlines the methodological foundations for the design of highly filled heterogeneous polymer compositions that are used as solid fuels for rocket and rocket engines. The two most important tasks of these compositions for charges are: ensuring the intraballistic characteristics of the engine and the mechanical reliability (probability of trouble-free operation and strength) of the solid fuel charge. These, often conflicting requirements, are provided by successive iterations of the main characteristics of the fuel: energy, ballistic, physical and mechanical, technological, operational, etc.