Abstract: in this paper,we propose a compressive sensing based cfar target detectiong algorithm for remote sensing sar image.considrd of the traditional mena value and statistic cfar detection algorithm,firstly,the background clutter pixels of every local sliding window is rebuild by using cs,so that the speckle of the sar image is decreased,then,the distribution parameters of the clutter are estimate from the rebuild image.at last,a cfar detector os used to botain the detection result.the experiments on real images show that the proposed algorithm is effective.