Abstract: To solve the problem of low killing efficiency of submunition,a kind of cross-shapedcanard bullets and its control system were proposed,analyzed and designed.For the problem of rotating submunition,the generation principle of the control force of submunition charge was analyzed,and the method of cycle average control force was put forward.To verify the flight stability of submunition,the Matlab software was used to do a simulation of the flight path without control.The horizontal displacement of submunition was 450 m,and the angle of attack was within 0.4°.Due to the strong coupling effect of submunition control channel,a pre-feedback compensation method was designed to decouple su bmunition and a PID controller was designed to simulate the control effect.Research results show that the coupling effect almost disappeares after decoupling.