This dissertation verifies the paradigm shift of interpretation occasioned by decisions concretist character from the Brazilian constitutional jurisdiction through which externalizes the political and legal phenomenon called by jurisdictional expansionism genus comprises the species named by judicial activism and legalization of politics, that have the inefficiency of the state run public policies, as well as the omission of legislative documents that restrict the enjoyment, by society, the constitutionally guaranteed fundamental rights, as motivators for change of parameter elements.For both, conducts research to identify concepts and historical elements of the evolution of the legal phenomenon to better understand the possible causes for the change in performance in the interpretation of decisions that carry the magistrates.