With the increase of the enemy's potential in anti-submarine,the current magnetic decoy magnetic source structure has the problem of large energy consumption of magnetic simulation,leading to insufficient decoy endurance,and it is increasingly unable to meet the combat needs at the operational level. To solve this problem,this paper proposes a single-electrode front-mounted combined magnetic source scheme based on the existing two-electrode magnetic source structure towed by the tail of the vehicle,establishes aerial magnetic field distribution model and conducts simulation analysis. The results show that the single-electrode front-mounted combined magnetic source structure can ensure a better simulation of the target magnetic field,reducing the current consumed by the magnetic simulation,and achieving efficient use of energy.