It was put forward at the 20th National Congress of the Communist Party of China. Report to the 20th CPC National Congress of the Party clearly pointed out: "The great changes in the new era in the past ten years are of milestone significance in the history of the Party, the history of New China, the history of reform and opening up, the history of socialist development and the history of the development of the Chinese nation." Studying this important political judgment carefully, we can see that the "great changes in the new era in ten years" is a new milestone standing on the land of China.