The space more freedom position control system is studied for the simulation experiments which provide experimental device space more freedom need space of X、Y axis roll and pitch motion. The system selects the siemens S7300 PLC as lower computer, the WinCC as upper computer. The control system used the modular programming design thought, timer interrupt for a long timing, PID control of electrohydraulic proportional valve opening to make the simulating platform pitch and roll motion of the fast track come true, and the failure to make the solution in the process of debugging.