Abstract: Using the raindrop spectrum and Ka band cloud radar data, the characteristics of a convective cloud precipitation process in Naqu on July 21, 2020 were analyzed. The results show that the precipitation process of the strong convective cloud showed obvious diurnal variation characteristics, and the convective cloud reached the strongest in the evening. There were obvious updrafts and downdrafts in the strong convection area. When the precipitation was the strongest, the radar echo reached above 40 dBZ, and the maximum cloud top height was 12 km, and the minimum was 720 m in the precipitation process. Compared with the M-P distribution, the Gamma distribution in Naqu was more suitable for the fitting of raindrop spectra of small-diameter particles (0~1 mm) of convective clouds, and the precipitation became more and more unstable with the increase of particle diameter .