On this day, 83 years ago, on February 27, 1942 (January 13, 1942 in the lunar calendar), the rectification movement across the party began. Mao Zedong talked with senior cadres of the Communist Party of China on the issue of rectification. In February 1942, the campaign launched by the Communist Party of China in Yan 'an and various anti-Japanese base areas to rectify the party's style moved from the preparatory stage to the general rectification stage. The Communist Party of China believes that after the Zunyi Conference in January 1935, the leadership of the Party Central Committee overcame the opportunist mistakes of "Left" and Right leaning, but the ideological roots of the mistakes had not yet had time to completely eliminate. The dogmatic mistakes of Marxism-Leninism that once prevailed within the party and sanctified the economy of the Communist International and the Soviet Union still bound the minds of some people. At the same time, after the Anti-Japanese War, a large number of petty-bourgeois people joined the Communist Party. They not only had revolutionary enthusiasm, but also brought many non-proletarian ideas to the party. Therefore, there are still problems within the party of impure thinking and impure work style. In addition, after the Anti-Japanese War entered a stalemate stage, the environment was relatively stable and objective conditions were available for carrying out rectification movements. In response to various problems existing within the party, in May 1941, Mao Zedong delivered a report entitled "Transforming Our Learning." In February 1942, he delivered reports on "Rectifying the Role of the Party" and "Opposing Party Stereotyped Principles". Mao pointed out that the content of the rectification movement was "opposing subjectivism to rectify the style of study, demonstrating factionalism to rectify the party style, and opposing Party stereotyped principles to rectify the style of writing." From then on, a rectification movement across the party began. The specific method is: based on studying documents, check your own work and thoughts, carry out criticism and self-criticism, and find out the root causes of mistakes and ways to overcome them. Senior party cadres also focused on studying and discussing party history.