As one of the main founders of the CPC, Li Dazhao' theory and practice of revolution partly originated from his attention and thinking of the Russian revolution. After the “February revolution” broke out in Russia in 1917, Li Dazhao began to pay close attention to the development of the Russian revolution, and think about the future of the Chinese revolution. After the outbreak of the “October revolution”, Li Dazhao talked more about the Russian revolution and began to promote Marxism. When he was talking about the Russian revolution, China's political future will always be the essences of his thinking. Li Dazhao went to Moscow to attend the Fifth Congress of the Communist International in 1924 to closely observe the change of social status after the establishment of the Soviet Union, and had a deeper understanding of the Russian revolution Chinese revolution road. Both the observation and thinking of the Russian revolution by Li Dazhao and the thinking of the Chinese revolution on that basis will deepen our understanding why the early communist leaders chose the Russian roads and Marxism, and how to employ the foreign experience of the revolution to the Chinese revolution practice.