On June 30, 1964, China conducted the second census, with the result of the census of 720.37 million people. On February 11, 1964, the Central Committee of the Communist Party of China and the State Council issued the "Instructions on the Second National Census", which clearly stated that the purpose of the second census was to formulate a third five-year plan (1966-1970) and provide the basis for long-term plans. The standard time for the national census calculation was June 30, 1964, at 24 hours. The census project, in addition to the six projects of the first census, added the degree of culture, composition and occupation, and the two were not combined. At the same time, the number of people born, died, migrated, migrated and registered in the first half of 1964 was not published at the time. By the time of the 5th