For braking impact and energy loss of high speed and heavy load hydraulic system which needed frequent start and brake,an energy recovery system was proposed in which hydraulic accumulator was taken as an energy storage element, and the displacement of the variable displacement pump in the hydraulic transformer was controlled reasonably to enable the pressure of the hydraulic cylinder brake chamber to meet the braking requirements.The working principle and control process of the system were introduced in detail.The selection analysis for the key components were done. AMESim simulation was used to to verify its feasibility.The simulation results show that the system has good braking effect and higher energy recovery efficiency.