Abstract: The rational fracturing and injection parameters would be the key to improve the flow capacity of the coal reservoir, to save the cost and to improve the g as production of the coal bed methane .According to the present features of the coal reservoir, an evaluation system of the coal reservoir propping agent was establishe d and the multi level fuzzy comprehensive evaluation method was applied to set up the optimization system of the propping agent.With the comparison on the fracturing liquid performances, the compatibility and other feature parameters, an optimized system of the fracturing liquid was established.According to the fracturing geology an d engineering influence factors, different hydraulic pressurized fracturing parameters were classified and the optimized system of the injection parameter under the diffe rent reservoir permeability was established.The system was successully applied to guide the design of the site hydraulic fracturing operation for the coal bed methane well in Panzhuang Block of Qinshui Basin.