In order to ensure the mine safety and high- efficiency production,the hydraulic fracturing and permeability improving technology of the coal bed methane well at the surface ground was applied to improve the permeability of the seam.The real time monitoring and measuring technology of the insetted type artificial fractures was applied to the real time monitoring and measuring evaluation on the fracture patterns occurred by the pressurized fracturing of the coal bed methane well and the effective fracture ra...