With the advantages of easy to move，flexible to extend and fold,large mobile stage has been gradually stepped into our lives and caugh our attention. As a new type of media means, it win warm praise from customers. The general structure and major parameters were determined through drawing kinematic sketch and making kinematics analysis in Pro/E.The key parts strength was also calculated and checked based on force analysis, and the finite element method was uesd to test the strength of the bearing seat. It is shown that the strength of the parts meet requirements. Hydraulic system was adopted in this equipment, and PLC was used as the contol this equipment.The practical application shows the equipment has stability, flexible and convenient control performance,and will have a good application prospect.