In order to research the characteristics of momentum downward gale and discussion on forecast method of momentum downward gale, the momentum downward gale process at Yinchuan Airport on 2022-03-06 was analyzed by using the reanalysis data of National Centers for Environmental Prediction (NCEP), conventional meteorological observation data, and wind light detection and ranging (LiDAR) data. The results show that Yinchuan Airport is located in the convergence area on the left side of the westerly jet inlet, which provides a favorable circulation background for the occurrence of momentum downward gale; Under clear sky conditions, the temporal and spatial evolution characteristics of momentum downwind can be accurately detected by the wind LiDAR product; the strong downdraft in the Doppler beam swinging(DBS) mode product marks the beginning of momentum downward transmission, the attenuation degree and change direction of the detection range of the plan position indicator(PPI) mode reflect the sand dust weather intensity and influence path, the occurrence and destruction of radial wind stratification at 500 m height in the range height indicator(RHI) model are the prediction indicators of momentum downward transmission changes; Using the wind LiDAR, the time of occurrence of downwind strong wind can be calculated and predicted 30 min in advance. This research is of great significance to improve the meteorological service support capability.