分析了溢流阀稳态调压偏差对液压提升机控制性能的影响，指出由于溢流阀稳态调压偏差的存在，使提升机控制系统的效率降低，控制特性较差。介绍了Ｇ型π桥溢流问的工作原理和稳态特性，指出Ｇ型π桥溢流间有利于提高控制系统效率和改善控制品质。 The influence of the steady state pressure regulating deviation of the relief valve on the control performance of the hydraulic hoist is analyzed. It is pointed out that the efficiency of the hoist control system is reduced and the control characteristic is poor due to the deviation of the steady state pressure regulating of the relief valve. The working principle and steady-state characteristics of the G-type π-bridge overflow are introduced. It is pointed out that the G-type π-bridge overflow is beneficial to improve the control system efficiency and improve the control quality.