Poland’s accession to the European Union impacted Polish international trade exchange significantly. Spreading common European principles, mainly the freedom of movement for goods as well as Common Customs Tariff (CCT), over Poland, contributed to annulment of tariff as well as quasi-tariff barriers in trade turnovers, but also to smooth the physical, technical and fiscal barriers within the Community. These barriers still exists in foreign trade exchange beyond the EU area. The aim of the paper is to present and analyze statistical data on foreign trade exchange of Poland directly in pre- and after accession periods, whereas special pressure was put on years 2004-2005. In the course of research the hypothesis stating that the accession of Poland to the European Union influenced on turnover of foreign trade favourably, was assumed and then proved.