This article concerns the origins, development and activities of one of the oldest Chinese democratic parties — the Democratic League of China from its inception to the formation of the People's Republic of China in 1949. New documents and materials discovered in the Russian State Archive of Socio-Political History, in particular, the Bulletins of the Information Bureau of the Central Committee of the All-Union Communist Party of Bolsheviks on foreign policy issues, shed light on little-studied questions about the role and place of this democratic organization in the Chinese revolution. Under patriotic slogans, the Democratic League united in its ranks both non-partisan public figures and political parties and groups with various views, from nationalist to pro-communist. Despite the diverse political composition of small parties and groups, the league turned into a coalition trying to find a “third way” between the Chinese Communist Party (CCP) and the ruling Kuomintang party. The growing authoritarianism of the Kuomintang leader Chiang Kai-shek and the implementation of pro-Japanese policies by the Kuomintang members undermined the foundations of the national anti-Japanese united front and undermined the war of resistance. These circumstances repelled the country's patriotic forces from the Kuomintang. The Kuomintang's suppression of the democratic movement led to a reorientation of the Democratic League's policies. The League publicly announced cooperation with the CCP until the complete collapse of the reactionary Kuomintang government, for democracy, peace and independence of the country. The work of the Democratic League helped to unite the broad groups of the population into the patriotic movement for a new China. After the formation of the People's Republic of China, at the suggestion of Mao Zedong, the league was preserved, its leaders received posts in the government. Currently, members of the Democratic League are mainly engaged in cultural and educational work.