A new infrared ground point background suppression algorithm based on the Nonsubsampled Contourlet Transform (NSCT) is presented.Raw image is decomposed using NSCT,different operators are adapted in different decomposition scales and directions,and background suppression image is obtained by NSCT reconstruction.When compared with conventional mathematical morphology Top-hat algorithm,several groups of experimental results demonstrate that the presented algorithm can suppress background effectively and the signal-noise ratio and contrast of image is improved efficiently.