Recoil energy measuring system of a underwater launcher is formed by means of horizontal recoil device, electromagnetic velocity sensor, measuring amplifier, transient waveform recorder and computer. 利用卧式后坐装置、磁电式速度传感器、测量放大器、瞬态波形记录仪及计算机组建了一套水下发射装置后坐能量测试系统。