The article presents selected issues concerning the Community coordination of pension systems. The first part of this article is devoted to regulations of the Community provisions which are applying when determinating pensions from Social Insurance Fund. The second part concerns the problems connected with realization of the law. The third part presents statistics data for 2007 concerning coordinated pensions, which are in the Polish Social Insurance Institution competence. In the summary the authoress presents results of applying in Poland the Community provisions on coordination of pension systems and concludes that the provisions are essential measure to guarantee the free movement of persons within the Community area.