Discharge driven continuous wave HF/DF chemical laser has been used widely in many research fields. The extensively adopted discharge scheme is high voltage DC power combined with ballast resistors,which is characterized by lower electrical efficiency,large volume and high cost,and is not convenient for use. Referring to the application of current-self-limited transformer on discharge electric gas lamp,current-self-limited transformer and selenium rectifier were used in this paper to make laser running successfully and reduce the volume of laser system significantly. This power supplication scheme is much simpler and can be applied to other discharge driven gas lasers.