The integration of European Communities have gone through several stages, namely free- trade zone, customs union, common market; at present it enters the stage of monetary- economic union. The main tasks connected with this stage are creation of a common monetary unit and coordination of economic policy by means of the European System of Central Banks and the European Central Bank itself. Curtain elements of political union are formed together with successive stages of economic integration. Poland, according to the treaty concerning association with European Communities, is supposed to go through radical structual transformations on its way to the membership.