Due to the absence of information concerning the location and number of scattering objects in inverse scattering problem

it results in nonlinear inverse scattering method calling for high refactoring space dimension and high computational cost.Based on the low computational burden with the linear inverse scattering methods in reconstructing the location and number of the targets

we propose a nonlinear inverse scattering method in this paper

which combined with DSM linear and CSI nonlinear inverse scattering methods.The reconstruction results of DSM are used as the prior information to provide the location and the number of the targets for the CSI method

which reduce the dimension of refactoring space and the amount of computation.Experimental results show the effectiveness of the proposed method.