The aim of the article is to define a rule of law for a proper functioning of the state, especially in the context of the provision of legal freedoms and guarantees to constitutional units. The determination of the was presented consequences of a breach of the rule of law which governs the complex acquis. The study will consist of attempts to define the rule of law, starting from the scope of this rule, on the basis of a doctrinal interpretation. This rule based on the Constitution of the Republic of Poland as well as on the Judgments Constitutional Court of the Republic of Poland. The specificity of the functioning of the European Union system requires to consider in this context the relationship between national and EU law on the regulation of the rule of law at the Community level. For the topic addressed, it is equally important to refer to the mechanisms provided by EU law to enforce Member States to respect common principles and values. The method used to implement the previously articulated objectives legal text interpretation.