BP Algorithm neural network is an important curve fitting method. For the inner self-adaption, the solution can reach to hire value in the way of any precision, and BP method can reflect the essence of social or natural phenome-nons. The BP thoery is applied to U. S. Population Forecast ,which expressed the the superiority of estimated population.%BP算法神经网络是一种曲线拟合方法,因为其内在的自适应性,可以以任意精度逼近非线性系统.通过曲线拟合能够较好地反映社会自然现象的本质.把这一理论应用于美国人口预测模型,体现了BP神经网络在人口估计中的优越性.
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