Abstract: Analysis of laser damage quadrant detector(QD) for laser guided weapon was presented in this paper. Firstly, the principle of laser damage photoelectrical detectors and QD detection theory were shown, detection bias and normalized detection curve were calculated based on the quadrant detector model. Then, Laser guided bomb trajectory simulated by weapon control model in different laser damage level were studied. Finally, undershoot value of laser guided bomb was discussed in different QD's laser damage distance. The research indicates that QD's laser damage level and damage distance influencing the laser guided weapon, and the result will be helpful for the effect evaluation of blanket jamming to laser guided weapon.