In order to adapt to the development trend that the nozzle of intelligent controllable ammunition engine is getting smaller and smaller, the aerodynamic numerical simulation was carried out for the vector control form of three swing arm spoiler. The results show that the thrust decreases with the increase of the main thrust angle. The maximum thrust loss is only related to the main thrust angle. When the main thrust angle is greater than 36 °, the aerodynamic interference between the spoilers increases. The lateral force increases with the increase of lateral angle and inlet pressure. As the three spoilers are all located in the engine wake, the interference of the lateral force adjustment in the front rear direction and the left and right direction is small, and the influence of the lateral force adjustment on the thrust is small.