Aiming at the problem that the tunnel boring machine (TBM) cannot meet the large open space required for debugging due to space limitation in the construction site,a hydraulic system of the lifting support for the disassembly and assembly of TBM was developed.The hydraulic system consisted of four groups of lifting units,by which the lifting and support of TBM was realized through synchronous movement of four groups of lifting units.The hydraulic lifting system consisted of four four-stage hydraulic cylinders,hydraulic control system,laser displacement sensor and frame.Based on AMESim,the hydraulic simulation models of four-stage hydraulic cylinder,variable displacement pump and the proportional throttle valve as well as the whole jacking unit were established.And the speed,displacement and pressure curves of the hydraulic cylinder movement under load were analyzed through simulation.The results show changing the input signal of the proportional throttle valve can achieve a change in the speed of the four stage hydraulic cylinder.The pump outlet pressure can be adjusted by a proportional relief valve.Under the rated load of 2.5 × 105 N,the pressure of the stage changing working chamber of the fourth stage cylinder gradually increases.As the stage changes,the extension speed of the piston rod gradually increases.Compared with theoretical calculations,the AMESim simulation results of the quick disassembly hydraulic system lifting unit in the TBM tunnel established are basically consistent with the theoretical values.