Abstract: In order to investigate precipitation process using wind profiler radar (WPR), an observation case is analyzed. WPR is very sensitive to precipitation process and can be used to detect many indicative phenomena before the rain. In this case, horizontal wind shear is recognized 10 hours before the precipitation, and the maximum observation-height increases by at least 2 km than usual. As the rainfall draws near, the height of downward speed gradually decreases.Data analysis shows that domestic WPR is applicable to work in precipitation weather. It provides various instructive data for studying precipitation such as horizontal wind, vertical wind and signal to noise ratio data. Further, WPR can provide data of wind speed, falling speed of rain-drops and their vertical distribution simultaneously, so it' s fairly useful for investigating precipitation process in depth.