Abstract: in orderto improve the water injection and dust controleffect of the low permeability sean a high pressurized hydrauli sloting and permeailityimprov.d technology was appied to the water iniecion and pemeailit improvement with a long borehole in the low permeatility seam.The sinil r simulation test analysis was appied to analyze the sotig pressure.cal and rock hardness and slotting noze diameter affected to the sot depth. A compaison and optimized ests were condu.ted on the sioting and permeability improvement method and the slotig and cutng discharging in the sean borehole in the underground mine. Based on the cicunstances,the sloting,permeailityimprovement and water nijction as well as the dust control effect were verifed. The study resut showed tat the slotng and permeablity improvement technology applied to the water injecion with a long borehole along an in the low pemealility coul efectively improve the water itf cion and dut control fflct. Afer the permeabilily improvement conducted,the total water inj ction vale would e1.9 times of no permeability borehole applied.The max watercontentincreased in the coal would be 1.6 times of no permeatiit borehole appied. The effective moisture radius was increased over 50% and the total dust controlefcsencywithin the moisture radius would be two times of no permeability water injection borehole.