Because of the high moving speed of the radar fuse carrier and the short working range of the fuse, in low latitude fight, the ground clutter is more apt to make the fuse burst ahead of the time. This paper sets up a simulation model of the ground clutter echo based on the net image method, analyzes the characteristic of the video signal of the ground clutter received by the fuse, and puts forward utilizing experience criterion to distinguish useful signal from the ground clutter, and using the narrow bandwidth filter to reject the ground clutter which can easily cause early burst of the fuse. The research result provides a technical basis for raising the anti-jamming performance of the fuse still further in the future, and it is very significant for raising the fight performance of the air defense weapon system.