Abstract：Under the depth of about 1 000 m in the deep mining，the pressure of the coal-bed is considerably high and the permeability of the coal-bed is low，in which the porous media are regarded to be highly compacted. Considering the percolation in this pre-pressing porous media，the slippage effects are remarkable，which will increase coal reservoir penetration function. So the experimental methodology is adopted to study the coal samples in Jilin and Fuxin City in order to explore the influence of slippage effects considering confining and pore water pressure，and to analyze the influence of slippage on the gas permeability under different confining and pore water pressures，and to find the range of confining pressure of beneficial influence of slippage on the gas log permeability of different hypotonic reservoirs. It verifies the universal existence of low permeability coal gas slippage effect. The experimental results establish the foundation of understanding the internal structure of coal and coal-bed methane slippage flow in coal seams and present significant theoretical value for carrying out coal-bed methane industrialization in hypotonic reservoirs.
