First lift platform in the process of lifting the buffer strength may be several times more than the weight, in order to be able to make the lift platform stability of lift to ensure the safety of the crawler chassis so early in the design for elevator chassis mounted above the hydraulic support system. Before lift platform simply control elevator electric control system and the crawler lift platform of elevator control system to control compatible with both before and after the walk, turn left, on the basis of the hydraulic support such complex electronic distribution project, we through unceasingly study experiment finally choose electronic computing and programming of PLC control system, all of the hydraulic circuit are all made of the distribution of the multiple directional control valves to dispatch control!