In view of the problems of traditional evaluation without jamming, target detection probability and false probability mathematics model of dual-model compound seeker are founded on jamming and no jamming period. Use object detection principle and process of passive radar/ infrared compound guidance as base, and adopt likelihood ratio principle to calculate the liminal value of dual-model compound seeker, realize quantificational evaluation of the anti-jamming ability, the applicability of which is validated by computer simulations. Simulation results show that dual-model compound guidance method has great advantages over single model guidance method alone.