A 220 t/h gas boiler of some steel group is taken as the study objectand the idea of oxygen-enriched stable combustion is proposed and proved to be feasible with the furnace heat transfer model in order to make reasonable use of existing resources and improve the combustion stability of gas boiler in low load operation.Detailed analysis has been made about the effects of oxygen-enriched combustion on the flu gas temperaturecombustion stability boiler thermal efficiency and so on.The results show that the oxygen-enriched combustion technology can greatly improve the overall performance of the boiler.