Drought risk management is a scientific way of drought mitigation and an important field in drought research. The risk quantitative assessment is the core of drought risk management. In order to reduce the error that caused by uncertainties and improve the reliability, a drought risk assessment model based on information diffusion and bootstrap is built, and the information diffusion and bootstrap are used to estimate the exceeding probabilities of drought loss and confidence interval of exceeding probabilities respectively. And then, the drought risk levels are presented by confidence interva...