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采用建模仿真的方法研究了红外干扰机对四元正交探测器的干扰效能。分析了四元正交探测器导引头的目标识别机理和干扰信号对目标识别的影响，建立了导弹总体仿真模型和干扰机干扰下的调制盘导引头和四元正交探测器导引头的目标识别模型。通过仿真定量地比较了不同压制比和占空比下红外干扰机对两种典型红外制导导弹的干扰效果。仿真结果显示，红外干扰机对四元正交探测器导引头的干扰效果明显不如对调制盘导引头的干扰效果；增大压制比可提高干扰机的干扰效能；当占空比为0.5时，干扰机对四元正交探测器导引头的干扰效能最大。“,”The jamming effectiveness of infrared jammer on cross-detector was researched by modeling and simulating. The mechanism of cross-detector seeker′ s target recognization and the influences of jamming signal on cross-detector seeker were analyzed. The total simulation model of missile and the target recognization models of reticle seeker and cross-detector seeker under jamming were established. By simulation, jamming effectiveness of IR jammer when jamming two representative kinds of IR missiles in different suppression ratios and duty ratios were researched quantificationally. The results show that IR jammer′ s jamming effectiveness on cross-detector seeker is much worse than it on reticle seeker;suppression ratio′ s increase can rise IR jammer′ s jamming effectiveness; the jamming effectiveness on cross-detector seeker reaches to maximum when duty ratio is 0.5.