Abstract: On the basis of the design of the three-DOF parallel hydraulic support, the Workbench software is used to establish the finite element analysis model of the parallel support mechanism. Based on the optimization analysis of the parameters of the column inclination and the position of the seat, the parameters of the hydraulic support are obtained. Through the analysis of the optimized parallel support mechanism, the hydraulic support in the X, Y, Z direction has a good ability to make pressure unloading. The results show that the three-DOF parallel hydraulic support technology can overcome the defects of the existing hydraulic load, can withstand different directions including lateral force, can improve the stability of hydraulic support and adaptability to the surrounding rock.