In allusion to the large vehicle platform requirements for high-precision leveling control,using three-point support hy-draulic leveling principle and on-off electro-hydraulic control technology,the maximum speed that hydraulic cylinder could maintain stable operation was deduced,the platform leveling precision and leveling speed were ensured and the system control strategy was sim-plified. So the large vehicle platform automatic leveling is achieved.%针对大型车载平台的高精度调平控制要求，采用三点支撑液压调平原理和通断电液控制技术，推导出调平时液压缸能保持稳定运行的最大运动速度，在保证平台精度和调平速度的同时简化了系统的控制策略，实现了大型车载平台的自动调平。
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