Abstract: High azimuth resolution and wide swath pose contradicting requirements on system design of synthesis aperture radar (SAR). In order to obtain high resolution and wide swath ground images, a possible solution based on Scan mode and compressive sensing theory is proposed in this paper. The Scan SAR mode can get wide swath, while the azimuth resolution of the sub-swath is low because of the incomplete azimuth illumination. The main processing steps of the proposed method include: the sub-swath data is zero padded firstly followed by the range compression and range cell migration correction; new data matrix is obtained by random selecting the effective azimuth rows; according to the random selection index set, a reasonable reconstruction matrix is built, which is used to reconstruct the targets’ azimuth positions information with ROMP algorithm; the combination of the sub-swath images provides the high resolution and wide swath ground image. The simulations verify the validity of the proposed method.