[Objective] To evaluate the capacity in flood disaster prevention and reduction in order to provide effective references for the regional government to make scientific and effective policies in flood disaster prevention and reduction.[Methods] The index system for flood disaster prevention and reduction capacity was composed of flood monitoring and warning

flood disaster prevention and waterlogging control

rescuing and rehabilitation as well as disaster management. The traditional entropy weight method was improved based on the minimum relative entropy principle and the rank ration method

and the weight of each index was calculated by the improved entropy method. The improved entropy method and cloud model was used to establish the evaluation model

and the capacity of flood disaster prevention and reduction of the Huaihe River basin in Anhui Province was then assessed.[Results] The flood disaster prevention and reduction capacity was at middle and lower leve land the spatial difference was obvious. Flood disaster prevention capacity in the northern part of the basin was higher than the south

and the eastern part of the basin was higher than the west. The flood disaster and reduction capacity was relatively high in the urban area

and relatively low in the rural area. Feixi County

Huaibei City

Bengbu City

Huainan City

Chuzhou City were at the high level. Changfeng County

Wuhe County

Fengtai County

Xiaoxian County

and Tianchang City

Fuyang City

Luan City was at a relatively high level. Feidong County

Suixi County

Dangshan County

Sixian County

and Suzhou City

Jieshou City

Mingguang City were at a middle level

while the others were at a relatively low and even lower capacity of flood disaster prevention and reduction.[Conclusion] Based on the evaluation results of flood disaster prevention and reduction capacity

the vulnerable spots in flood disaster prevention and reduction in the area can be identified

and the overall capacity in flood prevention can be improved.