Based on Ka-band millimeter wave cloud radar and rainfall data from automatic weather stations, this study analyzed the physical characteristics of rainfall clouds in the West Tianshan Mountains, from May-August 2019 and 2020. The results show that: (1) Rainfall mainly occurs at night. The cumulative rainfall was concentrated from 21:00 to 07:00 the next day. There was a significant positive correlation between rainfall frequency and accumulated precipitation. The frequency of heavy rainfall was the least, but the contribution to the total accumulated rainfall was significant; (2) The maximum average reflectivity of light rainfall intensity, moderate rainfall intensity, and heavy rainfall intensity were 30 dBZ、35.8 dBZ, and 39.5 dBZ, and the maximum average liquid water content was 1.5 g·m-3、4.2 g·m-3、7.3 g·m-3;(3) There are two concentrated areas for the reflectivity of different rainfall intensities. The reflectivity of 2.0~4.4 km were concentrated in 15~26 dBZ, and the reflectivity of light rainfall intensity, moderate rainfall intensity and heavy rainfall intensity near the ground were respectively concentrated in 24 ~32 dBZ, 29~38 dBZ and 31~42 dBZ. The frequency of moderate rain intensity and heavy rain intensity below 1.75 km where the liquid water content is less than 1 g·m-3 is significantly less than that of light rain intensity. The greater the rainfall intensity, the more concentrated the radial velocity of rainfall particles.