In the article the critical analysis of the main aspects of the party-government interaction in the Federal Republic of Germany is carried out. There are historical, conceptual, constitutional and legal, practical and political, and others. The fundamental approaches in German state-legal and political thought about evaluation of modern party role in German political system are considered. The influence of political parties on the formation and functioning of the state system is highlighted. The article proves that the party influence on the higher bodies of state power is much more intensive than it is provided for in the legal regulations. The thesis is also concerned with the place of parties in ensuring the cooperation between the state and society in Germany. The author notes the deformation of parties’ democracy in Germany, close connection between political parties and the state, weakening status of the political parties as public representants.