Abstract: In order to solve problem of a large amount of weathering-oxidized coal and mixed coal with low content of moisture and many very fines in Pingshuo,on the basis of raw coal assay,feasibility of separating these coals by FGX compound dry washing machine is studied,established dry coal preparation technology. The result shows that FGX compound dry washing machine is preferred for separating these coals,and then by a 13. 39% drop in ash content,yield of clean coal reaches 62. 02% with a4. 65 MJ/kg increase in calorific value; gotten 25. 06% yield of refuse with 73. 54% ash content and3. 89 MJ/kg net calorific value as well as 12. 92% yield of middlings with 41. 69% ash content and15. 55 MJ/kg net calorific value. It is remarkable for economic and social benefit as the result of simple dry coal preparation technology and low cost.