Abstract: The coal produced by Longmen Coal Mine is friable in nature with high degree of size degradation,high sulfur,and low calorific value,making it very hard to find to find a ready market. After an investigation of the properties of the raw coal produced by two adjacent mines,Guocun and Songshan,in the same coalfield,and the marketing condition of their products,a dry cleaning method is finally selected for upgrading Longmen coal. Result of industrial test and field application of the method demonstrates that the use of the method is highly effective for treating the low-moisture easy-to-clean Longmen coal. It would be economically unjustified if the coal is,otherwise,treated by wet method for its liability to undergo size degradation in water. The dry cleaning method proves to be cost-effective,low in initial and operating costs,short in lead time and there is less difficulty to control the coal cleaning operations.