Abstract: The power conditioning system for Xe-flash lamps pumped kW average power output solid state heat capacity laser (SSHCL) is described. It includes high power high voltage constant-current-charging system, capacitors bank, discharge control system, power supply of preignition for Xe-flash lamps, general control and diagnostic system. The practical application shows that the power conditioning system meets the design demands to operate at 7.5 kJ/pulse at a 10 Hz pulse repetition frequency, and runs well.