The aim of the research was to evaluate system transformation processes, i.e. market changes and European integration occurring in parallel. Both of these conditions have been the most significant influences on the economy of the countries of Central and Eastern Europe since 1990. The basis for this evaluation was an analysis of the changes in macroeconomic indicators specifying the level and the rate of GDP increase, inflation and unemployment in 1990-2007. It was established that the Polish economy developed faster in this period in comparison to the average level of 15 existing EU member states. Among the new members of the European Union (since 1 May 2004), Poland is one the most slowly developing states - with the highest unemployment rate, but also with relatively low inflation.