Abstract: The subject of this research is the complex of socio-economic and political-legal relations emerging in the context of the work of the Union State authorities. The object of this research is the executive authorities of the Union State. The article demonstrates that transition towards the market relations alongside the establishment of the Union State require reforming the public administration mechanism and generating the new democratic political-legal structure that leans on the principle of separation of powers. The key priorities of state authority becomes the protection of human rights and freedoms, which in turns, requires a transition towards the new in their essence legal forms and methods of the work of executive authorities. The authors’ special contribution into this research consists in proving that the normative-legal and socio-economic base of regional administration in the Russian Federation and Republic of Belarus significantly differs in its efficiency. Depending on the scale of administrative activity of one or another region, the authors propose the ways for optimizing efficiency of the regional administration. The scientific novelty lies in the introduced by the author new and improved methods for assessing the efficiency of work of the regional authorities in the organizations of integration character.