A new hydraulic system was built in order to recycle the potential energy of forklift.The work process of the new system was analyzed after expounding the work principle. Compared with current hydraulic system, throttle loss decreased because of the use of a new secondary regulation component Hydraulic Transformer (HT). The mathematical models of hydraulic transformer and hydraulic accumulator were established and the characteristic relations among accumulator valid volume, accumulator efficiency and HT port plate control angle were analyzed. The difference of potential energy recovery style between new hydraulic system and current hydraulic system was concluded. The potential energyre recycled was educed in the condition of no-load, half-load and full-load. The result indicated that the ability of recycling potential energy is improved by new hydraulic system and recovery effect is significant with the increase of pressure ratio.
