Describe the significant factors f

 Describe the significant factors for controlling population growth.（1）.economic factorsThe effect of economic factors on the natural growth of population is mainly reflected in that it determines the conditions for population growth and survival, and affects the natural growth rate of population by changing the birth rate and mortality rate of population. Generally, when the population cannot meet the demand of economic development for labor force, The reproduction of population itself is bound to be stimulated; when the population exceeds the total amount of consumption provided by economic development, the reproduction of population itself will be restrained. At the level of modern productivity, the natural growth rate of population tends to decline with the improvement of economic level. Economic factors also have an important impact on the mechanical growth of population. In general, The regions with developed economy or rapid development speed have a kind of attraction and cohesion to population, and the population mechanical growth is positive; on the contrary, the regions with backward economy or slow economic development speed will produce a kind of exclusion and dispersion force to population, and the population mechanical growth is generally negative.（2）.cultural factorThis factor has more influence on the natural growth of population. With the improvement of the level of science and literature, the natural growth rate of population tends to decline, especially in modern society, which is mainly manifested in three aspects: first, the average marriage age will be postponed due to the extension of people's years of education; second, the more developed the level of science and culture, The richer people's physiological knowledge, parenting knowledge and health care knowledge, the lower the infant mortality rate; the higher people's scientific and cultural level, the more they pay attention to the improvement of their own and their offspring's quality, the less they have to give birth to better children, and the limited income is used to train their children into modern people with higher scientific and cultural quality.(3).Medical and health factorsThe progress of medicine and the development of medical and health services have a direct impact on the birth rate and death rate of the population. First, it reduces the death rate caused by various diseases, thus reducing the death rate of the population and prolonging the average life span of the population. Second, it has a positive effect on the control of fertility and the implementation of eugenics.