Date: January 11-22, 1925
Number of delegates: 20
Party membership: 994
Major contents: The congress analyzed the role of different classes in Chinese society in the national revolutionary movement. It drew attention to the importance of leadership by the proletariat and of alliance between workers and peasants, pointing out that the China's national revolutionary movement could only be victorious with the powerful participation and leadership of the proletariat and that the Chinese revolution needed the wide participation of workers, peasants and urban middle and petty bourgeoisie, of which peasants were "an important part" and the "natural allies of the working class". The congress summed up the experiences and lessons in the cooperation with KMT since the previous year and worked out plans for unfolding the workers' movement, peasants' movement, youth's movement and women's movement. It decided to set up and strengthen Party organizations throughout the country to meet the needs of great development in the revolution. The congress also elected the new Central Executive Committee (CEC).
The Central Executive Committee elected Chen Duxiu, Zhang Guotao, Peng Shuzhi, Cai Hesen and Qu Qiubai as members of the Central Bureau, with Chen Duxiu as general secretary of the CEC.