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The complex ship wake under large sea conditions seriously affects the flight attitude of helicopter landing. In view of the problem that the conventional ship wake model is only suitable for studying the interference of helicopter longitudinal motion, based on the ship wake model described in the American Standard MIL-F-8785C, this paper proposes to increase the vertical disturbance component varying with height and establish the ship wake disturbance model with height, so as to realistically reflect the action intensity of vertical interference. After the model is introduced into the helicopter landing and hovering system, aiming at the poor effect of traditional PID control on height maintenance and position control, an improved PID control based on feedforward compensation is proposed. The comparative simulation results show that the proposed control method has high tracking accuracy and good robustness, it can meet the control requirements of helicopter landing and hovering under the disturbance of actual ship wake.