The article attempts to analyze the development of the party system in modern Russia during the 2021 parliamentary elections. The most important institutions of the discipline "Political Science" are considered as political power, political process, political regime, party system, parties, democracy, electorate, etc. The author tries to show that the general strategy of conservative modernization in Russia and the problems of developing social stratification and mobility of society significantly hinder the political and, specifically, the party system, party pluralism and ideological diversity in the country. The article summarizes some of the most important results of the last parliamentary elections in Russia, the alignment of parties, their rating before and during the elections, the balance of power in the new composition of the State Duma. The author tries to highlight the most significant reasons for the curbing of the process of party building, the difficulties of the genesis of new parties, the reasons for the decline of the role of old parliamentary parties, the electoral passivity of half of the country's population, primarily student youth and an educated, qualified part of the population of large cities ov Russia.