The jurisprudence of the Court of justice of the European Union generates principles with general character. These principles have value of law in within the space of the European Union and are applied only to the extent in which the general administrative law does not regulate these norms. In reality the administrative law of the Union represents the fruit of most of the principles of law of the member states, principles that determine themselves a significant impact within the other member states. The purpose of this study is to identify the role and significance of the general principles of European Union law this being the form through which the europeanization of the administrative law is being accomplished. To what extent the administration of the member states will be able to face this rapid evolution, it will depend on how powerful is the capacity of the national administrations to confirm the existence of an administrative space within the european sector.