By using Recurdyn, Multibody dynamics analysis software, a virtual prototype was established for a new type of hydraulic fork lifting platform,and the dynamic simulation was made in the case of different loads.Through the simulation, the force of hydraulic cylinder and the motion characteristics of the floating platform were studied,such as displacement,velocity and so on. Simulation results show that the stability of scissors mechanism becomes poor and the output force of hydraulic cylinder fluctuates increasely with the height of platform increasing. And analysis results provide references for the structural optimization design and control scheme of the mechanism system. 