Based on the total and low cloud cover, cloud form, precipitation data of 24 weather stations in Ningxia from 1971 to 2000, reanalyzed data of NCEP/NCAR in the same period, the spatial and temporal distribution of precipitation of stratiform cloud, convective cloud and mixed cloud and the circulation correspondingly are investigated. The results show that the number of precipitation times of stratiform cloud is much higher than that of the others and stratiform cloud precipitation is the main type of rainfall in 30 years. The heavy and torrential rainfalls are caused by mixed clouds. In the southern part of Ningxia, the stratiform cloud precipitation plays an important role, and in the northern part, convective and mixed cloud precipitations are crucial. Based on the results above, the suitable precipitation enhancing operation modes are discussed under different circulation and weather conditions.