Based on the wind field observation data in Beijing from 1971 to 2010, the influence of climate change and human activities of near-surface wind energy power were investigated, by using the linear-trend estimate and the principal component analysis method. The results showed that ① The curve of monthly variations of near-surface wind speed in Beijing is unimodal distribution during last 40 years.② The near-surface wind speed have significant difference at interannual and interdecadal change,it showed a weakly decreasing tendency over the 40 years at a rate of 0. 096m/s per 10 years. The areas distance more near the urban center, wind speed weakening tendency more obvious.③ The western and northwest coteau in Beijing region have abundant near-surface wind energy power reserve and should be considered as the preferential areas,while the other regions have really poor reserves.④ Results show that the physioclimate change and human activities are the main cause of the near-surface wind energy power decreased around 60. 2% and 27. 1%,respectively.