Abstract: Now we have developed a new power-source for continuous light-pumped YAG laser, whose energy consumption is reduced 43% and the non-failure life-span is doubled. The key technology of the new power source is to keep a proper current in Kr lamp.Generally,the current is a very high and the super high voltage is used to make the Kr lamp break down.We analyzed the negative resistant property of Kr lamp and designed a new circuit to reduce the maintenance current from several amps to less one amp.The experimental results show that circuit reduced the power consumption very much.