Using the method of disaster risk assessment, this paper analyzes the disaster causing factors and hazard bearing body fragility of drought in Guilin and conducts comprehensive evaluations on drought disaster as well. The assessment result is that the southeast of Guilin is the high risk area of drought while the northwest is the low risk area. According to the drought risk assessment conclusions, the study on artificial precipitation is made. Due to the difference of altitude and thickness of minus temperature zone of precipitation clouds in difference seasons, the pattern of artificial precipitation operation may be divided into two, one for summer and autumn and the other for winter and spring. The general goal is to sow AgI Ice nucleus into the minus temperature area of rainfall clouds, catalyze the cloud and increase the surface precipitation.