L&H crownblock motion compensator system is mainly used on drilling module of semi submersible offshore drilling platforms and drilling ship.The motion control model of the system is constructed by constructing motion compensation system.The establishment of the control strategy of generalized heave compensation drive hydraulic system,The drillstring in the drilling process can overcome platform under adverse sea conditions due to wave action and roll motion, pitching motion and heave motion and the motion coupling of the mutual influence and keep relative stability of drilling process.The drillstring in the drilling process can overcome platform under adverse sea conditions due to wave action and roll motion, pitching motion and heave motion and the motion coupling of the mutual influence and keep relative stability of drilling process.The main component is including beam of the overhead crane,vertical guide rail, guide pulley mechanism and hydraulic system etc..