Abstract: In order to obtain the combustion and slag characteristics of coal-fired power plants after sludge blending,as well as the pollutant emission law,pilot test studies are carried out for five working conditions （sludge blending ratio of 0,5%,10%,15%and 20%in the one-dimensional sedimentation furnace）.The results show that with the increase of sludge blending amount,the furnace temperature decreases,and the temperature at the top of the furnace decreases by 40°C when the mixing ratio reaches 20%.SEM and EDS analysis of the slag particles showed that with the increase of sludge incineration ratio,the slag tendency of the boiler increased,and the main components of the ash samples generated by combustion were K-Al-Si and K-Ca-Si composite salts.With the increase of the blending ratio,the emission of NO_xincreased first and then decreased,and the emission of SO₂gradually decreased.The contents of dioxins in flue gas and heavy metals in fly ash meet the requirements of DB 31/1291-2021"Emission Standard for Air Pollutants in Coal-fired Coupled Sludge Power Plants"and GB 8173-87"Control Standard for Pollutants in Agricultural Fly Ash".Through the calculation,it is found that the sludge blending will reduce the CO₂emissions,and when the sludge blending ratio is 20%,the CO₂emissions will be reduced by about 0.34%.Sludge co-firing in coal-fired boilers can be an option for efficient energy saving and carbon reduction under the dual-carbon strategy.