Abstract: Objective After the launch of the new generation high-resolution SAR satellites,high quality SAR da-ta of up to meter resolution became available.However,severe layover problems occur especially incomplicated scenarios like dense urban areas,which make high-resolution data interpretation more dif-ficult.SAR tomography(TomoSAR)aims at retrieving distribution of scatterers in the elevation direc-tion and retrieving the corresponding reflectivity inside one resolution cell.In this way,TomoSARcan achieve real and unambiguous 3Dreconstruction.First the basic principles of SAR tomography areillustrated.Then,a Butterworth filter based singular value decomposition method is proposed for To-moSAR processing.Third,experimental results about Berlin Debis Tower are analyzed in detail bycomparing them with real building heights,the estimation precision reaches the meter level.