Flood resources utilization(FRU) can alleviate the shortage of water resources, but there are risks, therefore it is necessary to study the risk of FRU. Based on the principle of the minimum risk, the maximum risk benefit and the minimum risk loss of FRU, a multi-objective risk decision-making model for reservoir FRU was constructed. Probability theory and mathematical statistics method were selected to calculate the risk rate , C-D production function method and value method were used to calculate the risk benefit, the risk loss was related to flood inundation area and unit area loss, and the multi-objective decision making problem of the model was solved by the constraint method. Taking the Shilianghe reservoir in Jiangsu province as an example, the optimal equilibrium solution of FRU of the Shilianghe reservoir was found by using the risk decision making model, and the validity and applicability of the model were verified.