Aiming at the magnetic abnormity causing magnetic field disturbance, use magnetic anomaly detector (MAD) to detect quiet submarine. According to checking search features, combined with the method which anti-submarine patrol aircraft using MAD to search submarine, establish the math models of single-aircraft and double-aircraft using MAD to detect math model of submarine searching. Through simulation calculating, analyze the influence of change of search acreage and MAD detecting distance on search detecting probability. The result proved that this method can gives effective suggestions for the optimization use of MAD.