Interventional poverty of rural reservoir migrants is induced by the impact of external engineering forces.The special secondary poverty is different from the primary poverty.It is difficult to measure accurately from the static income and expenditure dimension.This paper combines the improved A-F multidimensional poverty measurement method with the changes of migrants’ poverty status before and after relocation,and tries to construct a “multidimensional-dynamic” interventional poverty measurement system.Based on the monitoring data of rural migrants’ livelihood in the Three Gorges Reservoir Area,this paper studies the multidimensional poverty index and poverty-causing mechanism of migrants based on five non-income dimensions under the framework of physical assets and human capital,dynamic poverty types such as persistent type,impact type and temporary poverty-alleviation type.The results show that the reservoir migrants have got rid of high dimensional poverty,but fallen into low dimensional poverty; construction projects have not caused serious impact poverty,but neither has hydro-power development effectively alleviated persistent poverty; the poverty dimensions of migrants before and after relocation have changed significantly,and the influence of different poverty-causing factors on dynamic poverty varies.Accordingly,suggestions were made to improve the poverty identification and withdrawal mechanism for involuntary migrants,distinguish between different dimensions of poverty,and provide accurate solutions,innovate the resettlement model of reservoirs,and organically coordinate national support for resettlement,precision poverty alleviation and rural revitalization.