A model of the thermal degradation of polymer macromolecule was presented. The polymer molecule could consist of 100 unit elements. Te polymer molecule destruction had a random character and the arrising of all the possible products was included. The process was described by the set of kinetic equations and solved numerically. As a result a tool for the analysis of macromolecule destruction, rate of creation of the final product and amount of products for various kinetic constants was created.