Abstract: In order to investigate the outburst elimination effect of the technical measures for the hydraulic borehole flushing in No. 13-1 outburst seam of Pansan M ine, based on No.13-1 seam deposit conditions, the paper introduced the hydraulic borehole flushing trial with the borehole drilling through strata in-650 m East No.4 tra nsportation roadway of Pansan Mine.The paper had a study on the coal cutting quantity from the hydraulic borehole flushing, the gas content of the air flow, the gas flo W in the chock borehole, the gas drainage radius and the comparison with the gas drainage flow before and after the hydraulic borehole flushing.The results showed tha t when the coal cutting quantity per mater from a single borehole reached 2.0 ~ 3.0 t, the influence radius of the hydraulic borehole flushing in No. 13-1 seam would be 4.5 m.the gas flow from the check borehole would be over 10 times than before the hydraulic borehole flushing conducted the attenuation coefficient of the gas flow Wo uld be only 30% before the hydraulic borehole flushing.Within the hydraulic borehole flushing control region, the pressure in the coal body was released, the gas conten t of the seam was reduced about 70%, the outburst potential energy was released and the obvious effect of the pressure released and permeability improved was obtain ed.