The purpose of this paper is the presentation of issues connected with the implementation of framework decisions regarding substantive criminal law into the Polish legal order. The paper is composed of two basic parts. In the introduction is described the most significant legal instrument of the III pillar, implementing the harmonisation of the criminal law of the member states, that is the framework decisions. In the main part are presented examples of the implementation of chosen framework decisions in Polish law – the Framework Decision 2002/475/JHA on combating terrorism and the Framework Decision 2005/222/ JHA on attacks on against information systems. Certainly the choice is not casual. The author endeavours to present two extreme models of implementing of framework decisions: a method of implementation consisting in transfer of legal rules, with the aim of inserting created norms into the Polish legal order and the contrary one of rewriting the content of the implemented framework decision without any reflection.