Abstract: According to radars anti-deception-jamming, this paper studies an algorithm based on particle filter with the fact that the power of deception jamming is higher than target echo signal. When deception jamming appears, the importance weight values of particles in particle filter will get smaller, and we could detect the jamming and set the sampling point zero. In this way, the jamming will not match with the matched filter, and the jamming is restrained. In order to make the algorithm more practicable, this paper develops an improved particle filter that doesnt need to estimate state transition equation and measurement noise. Simulations are given to show that this approach can effectively restrain deception jamming and it is little affected by jamming to signal ratio.