Abstract: Pollution sources of hydraulic powered support in coal mine and their harms were thoroughly analyzed.Through research on blockage of high-pressure filtering apparatus of hydraulic powered support system in Huang Yuchuan coal mine 226 working face, analysis of the macroscopic feature of whole filter core, the elemental analysis and the dissolution of pollution ,and the quality analysis of the water for preparing emulsion were carried out. The results showed that, the outside pollution of filter core were rubber particles and pulverized coals, and the inside mainly were iron rust, metal residues,metal corrosion products and small amount of sediments; mass contents of Fe, Al and Ca were respectively 74.868%,10.218% and 4.581%.