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Population changes areaffected bymany factors,so theprediction and control ofthe populationis very complicated,it is difficult toin a modelconsideringall influential factors.Toforecastthe futurepopulation,the most important influence factor isthepopulation andlaterthis yearthe annual growth rate,populationforecastbased on the twodatais veryeasy。

The change of population is affected by different factors, therefore, it is very complicated to predict and control the population. It is difficullt to comprehense everything in one model considering various factors. In order to forecast the population in the future, the most important factor which may affect the populstion is the population this year the growth rate of each year afterwards. It is very easy to forecast the population according to thess two datas.

Population change received influence of many factors, so the prediction and control of the population is very complex, it is difficult to in a comprehensive considering various factors in the model. To forecast the future population, is the most important factors affecting the population and later this year the growth rate of each year, according to the data on population forecast is very easy.

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