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In terms of the uncertainties induced by wave disturbances when an underwater vehicle is operated by the surface of water and combined with the novelty Model-Converted Remotely Operated Vehicle (MC-ROV) of ocean engineering, a dynamic model based on CFD is built to analyse 6DOF positioning. A strategy of force and moment allocations is designed according to positioning error, then compensating it with an algorithm known as Non-singular Terminal Sliding Model (NTSM) to low the impact brought by waves likewise. Meanwhile Unscented Kalman Filter (UKF) is utilized to estimate the real-time states of the vehicle. Simulation results present that this algorithm makes the underwater vehicle reach a pre-given position rapidly and effectively, and it can adjust the strategy of force and moment promptly when encounters with perturbations so that reduces the negative effects.