Abstract: Based on the elastic mechanics theory and the rock fracturing citerion.acalculation model of the fwoa- dimensional induced tress field in the seam hydrcaulc fractring was esablis hed and the raticnalset guide siot and the conrol boreholelocation and the fracturing secuence obtained could realize the fractred crackschanged to form net cracks.Based on the circunstances.the guide sot directonal hyarauic pressurized peneration and permeatility improved technology were prowided.the appication of the jit drectihnal function of the guide siot and control borehole could reaize the directional hyaraulic pressuized penetration of the cal etween the guide s1ot borehole and the conrol borehole which would form the penetrated cracis and could clean the great cal cutings with the high prssurzed water and hus the seam pressure released and the seam permeabilly improved could be realized.Therefore ,a completed set of the guide sot dre cional hydrauic pressurzed penetration equipment was researched and developed and the guice slt directional hydraulc rssurzed penetration and permeability improved fechicue wvas stated. The site appication showed that the guide stot directional hydraulic pressurzed penetration technology could effectively preset theguide siot and could ealize the dro cton hydraulic pressurized penetraton.The gas drainage volume fraction was improved by 75%.the gas drainage quantity fromn a single borehole wa improved by 193%the regional outburst elimination measures were effective.