Laser angle deception jamming is an effective means to anti semi-active against laser guided weapons. In order to improve the anti-jamming efficiency of the laser seeker，based on the study of the real-time wave gate technology of the laser seeker，two control strategies of symmetrical contraction and biasing contraction for the wave gate are introduced. A calculation model of the effective probability of the jamming laser signal which accepted by the laser seeker wave gate，the jamming laser signal appears in the wave gate which obeys the normal distribution is also taken into account. The influence of jamming laser signal advance time，the wave gate width，the control contraction ratio and biasing value on the effective jamming probability is studied by using the method of control variables. The simulation results show that when the advanced synchronizing interference is adopted，there is a corresponding optimal jamming lead for different wave gate widths which can achieve the maximum effective probability of jamming signal. By setting reasonable isometric contraction coefficient and biasing value for the wave gate can effectively reduce the jamming probability and improve the anti-jamming performance of the seeker，Which can provide technical support for the research on the effectiveness of laser angle deception jamming.