The five beam observation data of the GLC 24 wind profiler are used to analyze the detection accuracy of wind profilers under clear and precipitation conditions, respectively. The results show that in clear weather wind profilers have a high detection accuracy on horizontal winds because the atmosphere is uniform and steady with a small vertical speed, while under the condition of uniform precipitation, even with a large vertical speed, wind profilers also have a good detection accuracy on horizontal winds because the atmosphere was relatively uniform within the detecting range of five beams, and under the condition of no uniform precipitation, in which the assumption of horizontal wind calculation of the wind profiler is unsatisfied, the algorithm should be improved to reduce calculating errors.