In order to improve the working efficiency and shear frequency of the existing steel scrap shearing machine,a 10 MN gantry shear hydraulic system was designed based on the original gantry shear.In this design,a multi-pump coupling system,the combination of intermittent and continuous oil supply and the control method of each shearing action without time interval were used.AMESim simulation analysis of the shear circuit hydraulic system was carried out.The simulation results show that under 10 MN load,the shearing frequency is increased by 22.1%,and the pressure and flow rate of the system meet the requirements,except that the hydraulic cylinder flow rate has a certain fluctuation when the shearing machine action switching.