Taking the dynamic wind speed measurement based on the buoy platform as the background, according to the principle of motion attitude compensation and actual needs, a dual-antenna GNSS/SINS integrated attitude measurement system is designed. Kalman filtering is used to achieve information fusion. The heading angle information output by dual-antenna GNSS is introduced into the measurement, which solves the problem of weak observability of heading angle of the inertial system, and the effectiveness of the system is verified by experiments. The experiments results show that the motion compensation scheme can improve the accuracy and stability of the attitude measurement, accurately measure the attitude information of the platform, and effectively reduce the influence of the platform motion on the wind speed measurement, and the wind speed measurement error is less than 4%. It meets the needs of marine buoy observation.