Based on Xichang sounding station's high altitude wind data in 2014, the wind direction frequency and monthly and quarterly average wind speed in the atmospheric boundary layer within a distance of 300、600 and 900 m is statistics calculated to analyze the characteristic of Xichang's atmospheric boundary layer wind field. The results shows that: the wind in xichang's atmospheric boundary layer changes greatly with the seasons. The wind: in summer, the wind direction is not single and usually dominated by SSW and N at each height. In winter, spring and autumn, there's south wind in the 300 m high while there mainly is SSW wind in 600、900 m high winds. The wind speed is biggest in spring, is smallest in summer