Abstract: The establishment of the ideological route of seeking truth from facts during Yan'an period, not only marked the "left" tilt error in the Party having a more thorough liquidation, but also provided scientific and ideological weapons for the normalization of political life within the Party. On the basis of profoundly summarizing the positive and negative historical experience, scientifically grasping the latest historical position of socialism with Chinese characteristics into the threshold of a new era, Xi Jinping clearly regards seeking truth from facts as the primary basic norm of serious political life within the Party, having opened up the historical connection between building the Party ideologically in the revolutionary period and put the Party's political construction in the first place in the new era further, and highlighted the "finding problems-analyzing problems-solving problems" practice logic of strictly ruling the Party since the 18th National Congress of the Communist Party of China.