As an important part of the leadership system of the Communist Party of China,the Central Political Bureau meeting system has had a significant impact throughout the Party's century-long struggle.The Central Political Bureau was officially elected at the First Plenary Session of the Fifth Central Committee and gradually became standardized,normalized,and institutionalized through overall design,adaptive changes,structural adjustments,and degree corrections before the Sixth National Congress.Therefore,clarifying the historical context of the establishment and adjustment of the Central Political Bureau meeting system before the Fifth to Sixth National Congresses is of great significance for understanding the functional positioning and scientific operation of the subsequent Central Political Bureau meeting system.