The subject of this study is to present principles of the system determine political character of the state and the system ruling in it of power. The analysis is covered constitutional regulations referring to the following principal principles: principle of the sovereignty of Nation, principle of democratic legal state, principle of freedom and of laws of individual, principle of the division of authorities, principle of the political pluralism, principle of the supreme position of the Constitution, principle of the decentralization of the official authority, principle of the decentralization of the official authority. The work is based on the legal-dogmatic method.