Initially, China's post-1949 leaders were ideologically disposed to view a large population as an asset. But the liabilities of a large, rapidly growing population soon became apparent. For one year, starting in August 1956, vigorous support was given to the Ministry of Public Health's mass birth control efforts. These efforts, however, had little impact on fertility. After the interval of the Great Leap Forward, Chinese leaders again saw rapid population growth as an obstacle to development, and their interest in birth control revived. In the early 1960s, schemes somewhat more muted than during the first campaign, emphasized the virtues of late marriage. Birth control offices were set up in the central government and some provincial-level governments in 1964. The second campaign was particularly successful in the cities, where the birth rate was cut in half during the 1963–66 period. The upheaval of the Cultural Revolution brought the program to a halt, however.

In 1972 and 1973 the party mobilized its resources for a nationwide birth control campaign administered by a group in the State Council. Committees to oversee birth control activities were established at all administrative levels and in various collective enterprises. This extensive and seemingly effective network covered both the rural and the urban population. In urban areas public security headquarters included population control sections. In rural areas the country's "barefoot doctors" distributed information and contraceptives to people's commune members. By 1973 Mao Zedong was personally identified with the family planning movement, signifying a greater leadership commitment to controlled population growth than ever before. Yet until several years after Mao's death in 1976, the leadership was reluctant to put forth directly the rationale that population control was necessary for economic growth and improved living standards.

Population growth targets were set for both administrative units and individual families. In the mid-1970s the maximum recommended family size was two children in cities and three or four in the country. In 1979 the government began advocating a one-child limit for both rural and urban areas and has generally set a maximum of two children in special circumstances. As of 1986 the policy for minority nationalities was two children per couple, three in special circumstances, and no limit for ethnic groups with very small populations. The overall goal of the one-child policy was to keep the total population within 1.2 billion through the year 2000, on the premise that the Four Modernizations program would be of little value if population growth was not brought under control.

Under the one-child program, a sophisticated system rewarded those who observed the policy and penalized those who did n…

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These are estimates as there are no registry data for that period. Sources: Our World In Data and Gapminder Foundation.
Notable events in demography of China:
• 1958–1962 Great Leap Forward
According to the 2000 census, the TFR was 1.22 (0.86 for cities, 1.08 for towns and 1.43 for villages/outposts). Beijing had the lowest TFR at 0.67, while Guizhou had the highest at 2.19. The Xiangyang district of Jiamusi city (Heilongjiang) has a TFR of 0.41, which is the lowest TFR recorded anywhere in the world in recorded history. Other extremely low TFR counties are: 0.43 in the Heping district of Tianjin city (Tianjin), and 0.46 in the Mawei district of Fuzhou city (Fujian). At the other end TFR was 3.96 in Geji County (Tibet), 4.07 in Jiali County (Tibet), and 5.47 in Baqing County (Tibet).

The 2010 census reported a TFR of 1.18 (0.88 in cities, 1.15 in townships, and 1.44 in rural areas). The five regions with the lowest fertility rates were Beijing (0.71), Shanghai (0.74), Liaoning (0.74), Heilongjiang (0.75), and Jilin (0.76). The five regions with the highest fertility rates were Guangxi (1.79), Guizhou (1.75), Xinjiang (1.53), Hainan (1.51), and Anhui (1.48).

The 2020 census reported a TFR of 1.301, with 1.118 in cities, 1.395 in townships, and 1.543 in rural areas. The shift of fertility rate recorded in 2020 census compared to that in the previous 2 censuses may not be an actual recovery, but rather due to the low quality and massive underreporting of lower-age groups in the 2000 and 2010 censuses, while the population control policy in China back then may also give families an incentive to hide their children, which is largely relieved as the policy changed in 2010s. This can be demonstrated by the much lower number of population aged 0~4 and 5~9 in the 2000 and 2010 censuses when compared to the corresponding age groups in 2020.

Total fertility rate by ethnic group (2010 census): Han (1.14), Zhuang (1.59), Hui (1.48), Manchu (1.18), Uyghur (2.04), Miao (1.82), Yi (1.82), Tujia (1.74), Tibetan (1.60), Mongols (1.26).
Source: UN World Population Prospects
In 1949 crude death rates were probably higher than 30 per 1,000, and the average life expectancy was only 35 years. Beginning in the early 1950s, mortality steadily declined; it continued to decline through 1978 and remained relatively constant through 1987. One major fluctuation was reported in a computer reconstruction of China's population trends from 1953 to 1987 produced by the United States Bureau of the Census. The computer model showed that the crude death rate increased dramatically during the famine years associated with the Great Leap Forward (1958–60).

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The People's Republic of China (PRC) officially recognizes 56 distinct ethnic groups, the largest of which are Han, who constitute 91.51% of the total population in 2010. Ethnic minorities constitute 8.49% or 113.8 million of China's population in 2010. During the past decades ethnic minorities have experienced higher growth rates than the majority Han population, because they are not under the one-child policy. Their proportion of the population in China has grown from 6.1% in 1953, to 8.04% in 1990, 8.41% in 2000, and 8.49% in 2010. Large ethnic minorities (data according to the 2000 census) include the Zhuang (16 million, 1.28%), Manchu (10 million, 0.84%), Uyghur (9 million, 0.78%), Hui (9 million, 0.71%), Miao (8 million, 0.71%), Yi (7 million, 0.61%), Tujia (5.75 million, 0.63%), Mongols (5 million, 0.46%), Tibetan (5 million, 0.43%), Buyei (3 million, 0.23%), and Korean (2 million, 0.15%). Over 126,000 Westerners from Canada, the US and Europe are living in mainland China. Almost 1% of people living in Hong Kong are Westerners.

Neither Hong Kong nor Macau recognizes the official ethnic classifications maintained by the central government. In Macau, the largest substantial ethnic groups of non-Chinese descent are the Macanese, of mixed Chinese and Portuguese descent (Eurasians), as well as migrants from the Philippines and Thailand. Overseas Filipinos (overwhelmingly female) working as domestic workers comprise the largest non-Han Chinese ethnic group in Hong Kong.
The 2020 Census counted 371,380 residents from Hong Kong, 55,732 residents from Macau, 157,886 residents from Taiwan, and 845,697 residents from other locations, totaling 1,430,695 residents.