The Communist Party of China attaches great importance to the ideological construction work. The evolution of ideology in the past century has been affected by many factors, among which, the basic national conditions, the principal social contradictions, the international situation, the law of ideology are the most important factor. The development course of the Party's ideological work over the past hundred years has been reviewed. Four important stages of ideological development and evolution are mainly including: during the revolutionary war, from the founding of the People's Republic of China to the reform and opening up, during the reform and opening up, and the ideological work in the new era. The following important experience of the Party's ideological construction is basically formed: adhering to Marxist guiding status is the basis for ideological work to follow, defending the Party's absolute leadership is the organization guarantee, conforming to China's basic national conditions is the evolution concept, adhering to unity of the Party spirit and people centered is the thought foundation, adhering to ideological struggle in harmony with mainstream ideology leading role is the method guidance, and integrating Chinese excellent traditional culture into ideological construction is the cultural source. It realizes the self-renewal and development innovation of ideological discourse system from revolutionary discourse to socialist construction discourse to comprehensively deepening reform discourse. Entering the new era, the Communist Party of China should dare to struggle and be good at struggling, and enrich ideological value, correct ideological bias, lead ideological development in the struggle, to gather the strongest ideological force for the great rejuvenation of the Chinese nation, which is the logical purpose of the theoretical approach of the ideological work of the Party in the past century.