A novel Power supply with a superimposed Power supply adjusted by cascadetransistors is developed and specifically used for CW YAG lasers pumped by double Kr lamps Specifically.Benefiting from the characteristic of the operating voltage of the Kr lamas; wecan adjust this power supply by using a superim small Power supply which is atransistor current stabilized source.This Power supply ases the same stability as theconventional one while deserting the clumbersome high Power voltage transformer.