This paper concentrates on heading control problem of the near-surface-sailing underactuated AUV systems affected by the wave force disturbances.Firstly,the AUV nonlinear system model is converted to the Brunovsky system model by differential homeomorphism.Secondly,the exosystem of wave force disturbances is built based on the Morison equation,and added to the equations of AUV as well.Under this circumstance,the horizontal plane model of AUV with wave force disturbances was built.According to optimal contro...