中文摘要：

本文利用华北地区1957-2006年共计50a 104个气象观测站的实测风速，分析了该地区年平均风速的空间分布特征、逐年代变化特征、近50a来的变化趋势以及风速突变现象，研究表明，华北地区风速呈西北和东南地区偏大、东北-西南向风速偏小的分布特征；风速有减小趋势，大部分台站风速减小趋势达到了-0．2～-0．5（m·s^-1）／10a；华北南部风速最先开始突变，西部次之，北部和中部没有检测到突变时间。

英文摘要：

In this paper, the characteristics of wind speed variations, including distribution of annual mean wind speed, decadal variability, distribution of linear trend and sudden change of wind speed, were investigated based on the observed monthly mean wind speed in 104 gauges, located quite uniformly over the territory of north China. The results showed that as far as distribution of wind speed was concerned, there is higher wind speed in the northwestward and southeastward of north China and smaller wind speed in the northeastward and southwestward, and that annual mean wind speeds have tended to decrease, the value in most of gauges reached 0. 2-0. 5 （m·s^-1）/10a. Meanwhile, the sudden change of wind speed were found, the early one occurred in the south of north China, and the second one appeared in the western region, and there are no robust times in northern and central region.