Abstract: The ever stricter demand for eco-enviromental protection in China calls for exercising stricter control of the coal dust generated in the process of dry cleaning of coal. For improving dust collection efficiency in pneumatic cleaning of coal, a novel 3-stage dust collection process is developed on the basis of the technology originally applied and by incorporating the advantages of several conventional processes, and through optimization of the structure of bag collector with addition of inertia-type dust collector. Its application for the coal dry cleaning system in the phase Ⅱproject of C power plant in Candiota, Brazil has met with a remarkable result, with the density of particle matters in gas emissions being only 19.8 mg per cubic meter, far bellow the standard-specified figure. Furthermore, the collector can work steadily and reliably without plugging phenomenon.