Abstract: Bailonghu reservoir area is carried out artificial precipitation operation,which needs a refinement of the forecast for the region.And the forecast must be 1 ~ 2 days in advance to make sure that whether or not the region is prepared according to the weather condition.Then workers can prearrange operating personnel in place,and when the rainfall occurs workers can capture the best optimal timing of operation.This article is based on the heavy rainfall weather process from July fifth to sixth in 2011.The paper analyzes detailedly the topographic influence,circulation forms,practices,radar data,regional rainfall monitoring stations,satellite images,etc.about the artificial precipitation operation of Bailonghu reservoir area.And the paper also omnifariously analyzes that how to grasp the best opportunity on the implementation of the ground in the Bailonghu reservoir artificial rainfall operations.