Since the spring of 1942, a general rectification movement has been carried out throughout the party. The contents of the rectification are: opposing subjectivism and rectifying the style of study; Oppose sectarianism and rectify the party style; Oppose stereotyped Party writing and rectify the style of writing. The principle of rectification is to learn lessons and save lives. Starting from the desire for unity, through criticism and struggle, we can achieve the goal of unity on a new basis. Yan 'an Rectification Movement is an educational movement of Marxism-Leninism, an ideological revolutionary movement to overcome wrong understanding with correct understanding and non-proletarian thinking with proletarian thinking, and a great ideological liberation movement to break the shackles of dogmatism represented by Wang Ming within the party. This is of great significance for promoting the integration of Marxism-Leninism with the concrete practice of China revolution. It is a successful practice to correctly solve the problem of proletarian party construction, and laid the ideological foundation for the victory of War of Resistance against Japanese Aggression and China revolutions.