Abstract: There was significant correlation between China’s industrial waste gas emission and carbon emission, and it is necessary to further study the waste gas emission reduction which is the important approach and key breakthrough point to realize carbon emission reduction. A carbon emission reduction calculation method was set up for the waste heat utilization, the waste pressure utilization and the recycling of waste gas with heat value based on the energy balance principle. The current technologies of waste gas recycling of sintering machine, cement kiln cooperative treatment of domestic wastes and municipal sludge, and exhaust gas cascade utilization of electrolytic aluminum industry to coal-fired power plants were introduced. The corresponding carbon emission reductions by waste gas recycling in these industries were calculated and analyzed. The results showed that the industrial waste gas recycling technologies could reduce emission of waste gas volume and thus reduce emission of CO₂, contributing to almost 25% of the total carbon emission reduction in China. The technologies should play an important role in waste gas emission and CO₂ emission reduction, and be the important approach to realize carbon emission reduction target in 2020. Therefore, the development of the waste gas recycling technologies should be strengthened.