Abstract: This paper propose a method for moving target imaging and parameter estimation,which is based on ROI of multi-channel UWB SAR images.As the consequent step after GMTD of image domain,the proposed method firstly focuses the moving target and estimates its relative velocity using its ROI.Secondly,the method estimates the range velocity of the moving target based on its focused multi-channel images.Finally,the method estimates other parameters,including azimuth velocity,azimuth position and range position.The method has been proved to be valid based on half real data.