Abstract: Aiming at impact of current agricultural disasters to agricultural production，it is necessary to strengthen risk assessment and hazardous area division for regional agricultural disasters，and then put forward relevant agricultural control measures，which is an effective way to solve current agricultural disaster losses.According to above requirements，a risk assessment model for agricultural flood disaster was proposed by analytic hierarchy process and comprehensive weighting method. And then take Guanzhong agricultural flood of Shaanxi disaster as an example，on the basis of GIS，risk area of flood and waterlogging disaster in Guanzhong area of Shaanxi was divided，and then severity of agricultural disaster in Guanzhong area was presented.By comparing calculated data with historical data，it was found that risk distribution of flood disasters in Guanzhong was basically consistent with historical data，which further verified feasibility and accuracy of above methods，and provided a reference method for prevention of agricultural disaster risk.