Abstract: A chemical oxygen-iodine laser (COIL) with a square pipe-array jet-type singlet oxygen generator (SPJSOG)， an array of supersonic I2 – O2 mixing nozzles and nitrogen buffer gases was demonstrated in our laboratory. In our primary experimental stage, an output power of 1.8kw was obtained for a chlorine flowrate of 110mmol/s, corresponding to a chemical efficiency of 18%. The SPJSOG has shown great stabilities during operation in the case of no gas-liquid separator and cold trap. Although not optimized for the nitrogen buffer gas in our primary experimental stage, the COIL device has shown great potential to approach the performance of the COIL with helium buffer gases.