This research will aim the pollution problems of boilers and find ways to improve them. Use the gas boilers should have improved the air pollution problem. However, people's life needs have increased the use amount of boilers compared to the past. it is necessary to further decrease energy consumption and reduce emissions. Although there are many ways to improve the boiler today, most of the methods require equipment changes or cost increases due to special chemical materials. The research process found the goal from the use of the catalyst and will be studied through fluid mechanics and simulation analysis experiments to design a suitable method to solve how the catalyst is combined with the boiler and effective.