Abstract: In order to heighten the success probability of jamming interference and overcome the questions such as:interference signal offset and success probability were fixed substantially during synchronization interference and seeker had opportunity and conditions to take further anti-jamming measures when interfering signals and guided wave signals were in wave gate, a new jamming strategy based on wave gate decoy was put forward according to the principle of real-time wave gate. The method and key process of decoying wave gate were discussed and the tactics of jamming was studied. Taking repetition guided signal as example, the jamming signal based on interval modulation was designed, and the restriction of interference signal was gained. The joint distribution of wave gate and guided signal was derived. Through theory and simulation analysis, the results show that the wave gate isdecoyed and the success probability is promoted. The strategy is feasible and better. The jamming strategy is valuable for new jamming method research.