Abstract: Considering the connecting characteristics of different maritime targets,an offshore telescopic compensation hydraulic control system is designed,which integrates active wave compensation,constant support force compensation and low resistance force compensation. For this new wave compensation hydraulic system,the mode control strategy and mode switching strategy are designed. According to the simulation results in AMEsim,the designed telescopic hydraulic control system performs well in three operating modes,and the mode switching processes are smooth. This new multi-functional telescopic compensation hydraulic system of offshore trestle will provide great guidance for the future trestle design.