Abstract: In the rectification movement of the Yan'an academic style, Ai Siqi, focusing on the spiritual core of Mao Zedong's Reform Our Study, insists on the unity of learning reason and politics, constructive and critical, knowledge and value, deeply discusses the essence and root of subjectivism, analyzes the two forms and connections of subjectivism, enriches the theoretical connotation of “seeking truth from the facts” and “shooting the arrow at the target”, and puts forward the method of forming materialist thought. In the new stage of development, Marxist theory workers should adhere to the realism and Sinicization of Marxist theoretical research, strengthen the proletarian stand and the idea of learning for the people, and consciously apply dialectical materialism world outlook and methodology to promote the interpretation and propaganda of the Party's theoretical innovation achievements.