Abstract: Since the implementation of ultra-low coal power emissions, air pollutant emissions have been further reduced, and environmental protection equipment has been rapidly developed, but there are still certain problems in the stability and economy of the equipment, which need to be solved urgently. The ultra-clean electrostatic-fabric integrated precipitator is an upgraded equipment of the electric bag composite dust collector. Its stability and economy are greatly affected by the Parameters of the uniformity of the flow field, the equipment resistance, and the filter wind speed. The conventional electrostatic-fabric integrated precipitator also has large optimization designs Pace.Taking a 2×1000MW unit of a coal-fired power plant as the object, the targeted optimization design is carried out around the uniformity of the flow field, the resistance of the equipment, and the filtering wind speed. Adopt three-dimensional air intake design method, establish a flue gas turbulence model suitable for ultra-clean electrostatic-fabric integrated precipitator, etc. to improve the uniformity of the flow field; optimize the coupling and matching of the electric area and the bag area, improve the filtering accuracy of the filter material, and reduce the resistance of the equipment; After comprehensively considering the actual working conditions of the project, emission concentration and other requirements, the optimal filtration wind speed was finally determined through the research of the small experimental bench in the factory, and the design optimization plan was equipped with a filter bag longer than 8.5 meters. After performance testing, all indicators of ultra-clean electrostatic-fabric integrated precipitator can meet the design requirements. The dust concentration at the outlet of the precipitator is less than 5mg/m~3, the flue gas flow deviation of each chamber is less than 2.5%, and the equipment resistance is less than 750Pa, which is compared with the conventional electrostatic-fabric integrated precipitator, the flue gas flow deviation 5%, the equipment resistance is 1200Pa, and the outlet dust 20mg/m~3 are greatly improved, indicating that the ultra-clean electrostatic-fabric integrated precipitator can be stably applied, and it has better stability and economy than conventional electrostatic-fabric integrated precipitator.