To fill the blank about the dynamic performance test equipment of the largescaled damper in nuclear power plant, to solve the bottle neck problem of dynamic performance research about dampers, to provide protection for largescaleddamper on domestic manufacturing and autonomous maintenance inservice, adynamic performance test bench was designed, the test bench had dualpower head, hydraulicdrive system, a plurality of detection sensors, full digital control and other characteristics, and can provide fullload, fullfrequency, continuous online, imitation test for the damper. The test results show the test bench can fully meet the dynamic performance experimental requirements for the largescaled damper in nuclear power plant.