Abstract. The article examines the uniqueness of the parliament as a political institution, which plays a of interest groups at the state level, forms. At the stage of democratic reforms а change of a social structure occurs rapidly, and it often happens, that the  role of mediator  between  society  and  executive  authorities;  a  system,  where  the  nation’s  ruling  will,  based  on  a  structured  representation necessary institutional changes occur with considerable delay in time. The inertia of the Ukrainian political system is largely related to  deficiencies  in  the  functioning  of  the  parliamentary  institution.  The  modern  Ukrainian  political  practice  shows  an  inability  of government  institutions  to  manage  effectively  the  socio-economic  and political  processes.  A  distinctive  feature  of  the  post-Soviet Ukraine was the continued instability of the entire state system, which deepens by the lack of forms of authorities responsibility to overcome the modernization syndrome. Reducing of a transitional democratic transformation period in Ukraine objectively requires the formation of a working system of feedback between the social environment and political system. Here the role of national parlia- ments can not be overemphasized. The process of consolidation of a democratic society has to happen against achievement by the Ukrainian parliament of the corresponding external forms (a democratic election system and the constitutional fixing of the appropri- ate parliamentary authority, inherent parliamentarism of the western type). Filling of these forms by the democratic content should be accompanied by ordering of an effective system of political representation of real public interests, creation of effective mechanisms of control over the executive branch, increasing the degree of openness of the parliamentary process.