The Constitutional Court of The Republic of Croatia is dermined primarily by the Constitution of the Republic of Croatia and the Constitutional Act on the Constitutional Court of the Republic of Croatia. The introductory part of the paper describes in general the Constitutional Court of the Republic of Croatia and Constitution and other related laws. The second parto f the pape mentions the development of the Croatian judiciary through history. The third part of the paper spekas a bit more about the Constitutional Court, its legal acts, scope, competencies and other competencies that the Constitutional Court perfoms. The foruth and fifith part of the paper include sections that show how the proceedings before the Constitutional Court are initiated, how the Constitutional Court acts and annuls regulations, and the Constitutional Complaint is mentioned. The last part of paper is based on the political influence of the Constitutional Court and the difference between the European and american models of monitoring constitutionalitx and legality.