At present, the basic and the most important final aim for central banking is to achieve and maintain stable, low inflation. During the last several years BCI conception gained considerable popularity, which is reflected in the growth of number of central banks leading monetary policy according to that strategy. The aim of this paper is to review the realization of the monetary policy in Poland in years 1999–2008 as well as in long-term perspective. The reason of non-achieving the inflationary aims are situated in supply factors (such as changes of controlled process, fluctuation of food process or changes of raw materials prices), fluctuation of economic situation in world economy, dynamics of internal and external demand and expansive fiscal policy.