Abstract：This paper, taking Huainan Mining Group Xieqiao mine as research background, analysed the outburst prevention mechanism of hydraulic punching technology and described the process of hydraulic flushing.By examining water pressure, water flow and coal volume per meter of a pore in the process of punching hydraulic flushing and the efficacy of standard rate and other parameters in excavating period before and after punching, eliminating outburst effect and main influencing factors of the hydraulic punching technology measures in excavating were analysed.The results show that the hydraulic punching measures could well increase the strength and permeability of coal, effectively eliminate or reduce the flexibility and gas potential of coal, reduce or eliminate seam outburst.

Keyword：hydraulic flushing;outburst coal layer;eliminating outburst effect;