Song Jian, deputy director of the Population and Development Research Center of Renmin University of China, said that negative population growth is the inevitable result of the long-term low birth rate after the demographic transition. Zhang Xuying pointed out that a large population, a large economic aggregate, an aging population and fewer birthrates, advantages in human resource endowment, population urbanization, and large regional differences in population development are the initial conditions for my country's negative population growth.