China's population continues to grow,the proportion of the aged is getting larger,and the pressure on employment and social security is mounting. 人口总量继续增加，老龄人口比重上升，就业和社会保障压力增大。
The Chinese population time series models have been formulated, but the Shaanxi population time series model has not been researched into. 对全国人口总量时间序列模型，已进行了一定的研究，对陕西省人口总量时间序列模型尚未研究。
