Observation data from 8 weather stations from 1971 - 2010 in the western Chaidamu Basin were applied in the study. By climate statistical diagnosis method,the climate change trend and mutation of average wind speed and strong wind days were studied. Results indicate that the annual,seasonal and decadal changes of average wind speed and wind days in the study area were declining in the latest 40 years. The falling range of annual average wind speed was - 0. 28m·s ~(-1) /10a(P < 0. 01),and summer > spring > autumn > winter. Average annual strong wind days reduced by - 5. 8d /10a(P < 0. 05),with the maximum reduction in summer and smallest in autumn and winter; the maximum number of strong winds appeared in spring,accounting for 44. 2% of annual strong wind days. While in autumn strong wind days were the minimum and the wind speed was lower, and these were related to the atmospheric circulation. Abnormal annual and seasonal mean wind speeds were appeared in the 1970s,which related to the severe desertification at that time. The relationship between temperature, precipitation and wind days was negative,and to a great extent,this explained the reason why the wind days was decreased,and the obvious increase of precipitation was the main reason.