Abstract: Given the special nature of China's national conditions, the Party must solve its number one innate problem: how to advance the great project of party building in a country with a relatively small number of workers to achieve the goal of building the party "in a nationwide and mass way". It was not until the Yan'an Period that the Party established the basic principle of ideological party building in practice, thus solving this problem fundamentally. After the founding of the People's Republic of China, the contents and forms of ideological party building were further enriched and perfected through the arduous explorations of successive Chinese Communists. To comprehensively advance the great new project of the Party building in the new era while adhering to the basic principle of building the Party ideologically, we must also take political construction as the orientation, organizational construction as the foundation, style construction as the starting point, system construction as the guarantee, and discipline construction as the criterion. This is an important inspiration from the construction practice of the Communist Party of China in the past hundred years.