Emergency

The family control policy suits China’s basic conditions and serves the interests of the whole nation.

 formal school education

 the transfer of rural surplus labors

 social security system

population replacement level

 the aging of population

floating population

movement of population

urbanization

 average annual growth rate

 average annual increase

 large population base

 annual increment of the population

 life expectancy at birth

 total fertility rate(tfr)

contraceptive prevalence rate

 infant mortality rate

 maternal mortality rate

premarriage health checkings