Problem of shaping plastic products by methods of plastic working and computer simulation of an extrusion process. Concise characteristics of some selected plastics shaping processes, properties of polycarbonate PC chosen for tests and procesure and results of experimental investigations. Computer simulation of an extrusion process - choice of a method, determination of boundary conditions and obtained results. Ascertainment of the computer simulation results being in conformity with those from experiments. Attention called to the specific thinning of a drawpiece in the place where radius passes from the boottom into the cylindrical wall.