Abstract：In order to study the penetration law and the mechanism of increase permeability of the coal under the action of Fenton reagent, three coal samples of different coal ranks, including anthracite coal from Jiulishan coal mine in Jiaozuo coal group Co., Ltd., coking coal from Zhujiao coal mine Co., Ltd., in Anyang city, and long flame coal from the Yangcun coal mine in Yima coal group Co., Ltd., were selected, and the changes of permeability after the samples being subjected to pressure saturated soaking treatment with Fenton reagent were studied. At the same time, the comparison of T₂spectra and infrared spectra of coal samples before and after their treated by Fenton reagent was conducted to investigate the mechanism of increase permeability. The results showed that: Fenton reagent led to increase the volume of macropores and fissures in the coal sample, and internal connectivity in the coal sample became better. The increase of oxygen-containing functional groups on the coal surface with Fenton reagent inhibited the adsorption capacity of coal on methane. Through the comparative experiments of three kinds of coal samples, it was proved that Fenton reagent had a good increase permeability effect on low-rank coal samples. The conclusions provided a new method and theoretical guidance for improving the permeability of coal seam.

Keyword：Fenton reagent;coal;penetration law;mechanism of increase permeability;