The overshoot synchronized jamming forwards the jamming signal into the laser guide head wave gate with a fixed amount of overshoot, the jamming success probability is basically fixed, and the jamming and guidance signals are in the wave gate at the same time, so that the guide head has the opportunity and conditions to take further anti-jamming measures. According the principle of real-time wave gate, a new jamming strategy based on wave gate decoy is put forward in this paper. Firstly, the jamming signal is designed to explore the mechanism of interference. Then, by analyzing the timing relationship and interaction process of the guidance signal, the interference signal and the wave gate, the signal distribution within the wave gate under the interference condition is obtained. Finally, typical parameters are selected, and two interference states, the synchronization jamming and the wave gate decoy, are simulated to obtain the characteristics of wave gate on signal admission under interference conditions. The relative advantage of wave gate-induced bias interference is verified with probability analysis, and the analysis results can provide a reference for the design of interference parameters and processes.