DDS catalyst and DDS desulfurization technology has already played an import role in purifying raw industrial gas. This technology is widely used in synthetic ammonia, coke oven gas, city gas, dye waste gas treatment, etc, resulting in great economic benefits as well as environmental and social benefits. Based on such technology, after nearly thirty years research, DDS flue gas desulfurization and denitrification technology proved to be success in pilot test and small-scale industrial trials at the end of 2013. Just like the DDS catalyst and DDS desulfurization technology, this technology is likely to generate significant social, environmental and economic benefits.