A cryogenic adsorption technique was presented to replace the machinery pump and exhaust processing system,which could provide a possible way to greatly suppress the size of a discharge-driven CW HF/DF chemical laser.As the nitrogen diluent must be used instead of helium for the cryogenic adsorption pump, the efficiency of HF/DF chemical laser would be lowered down greatly. To solve the problem,a periodically arranged supersonic nozzle array composed of slit and conical holes with a 4 mm period was developed to replace the traditional single slit transverse sonic fuel injecting gain generator. Experimental results with HF laser demonstrates that the laser output and electrical-optical efficiency by designed supersonic nozzle array have been increased from 25 W to 90 W,and 0.8% to 5.9%,respectively.Furthermore,the fuel specific efficiency has a nearly fourfold increase,which is slightly higher than that from the helium diluen. Obtained results prove that the efficiency of the nitrogen diluted discharge-driven CW HF/DF chemical laser can be greatly improved by using the devel-oped supersoinc nozzle array.