Abstract: The courses of the energy transfer from electricity to the Nd:glass disk were numerically analyzed, such as electricity-light conversion of Xenon flash lamp, cavity transformation, the absorbing of pump-light converting to the laser-energy level and decay. The theoretical and experimental results show that the boosting of energy-storage efficiency of the flash-lamp pumped Nd:glass amplifier should be achieved by means of improving the material, design and fabrication of the amplifier and its power conditioning system.