Population Model And Demographic Analysis

The population system is a complex system, which concerns about the population number, population quality and population structure. The stability of the population development affects the continuance of the development of our society and economic. It is very important to describe and forecast the population and all kinds of the population exponents, which can contribute to constitution for the policy of our population development. In this article, we discuss the mechanism of population development system based on the population development equations. At first, we analyze the law of the death rate function at every age, the migration function, the model of bearing, and construct forecasting models and get the forecasting results respectively grounded on characters of the functions. Then we use the discrete population development equations and the forecasting results to study the future population structure and the status of our population system for the middle term and the long term, which can provide the theory and data for our government to design the population stratagem. At last, we establish the life table which is the basis for the actuary and life insurance.