Abstract: According to the occurence conditions of coal seam gas and geological conditions of Hexi coal mine, the coal seam gas control measures based on mining technology protective layers are taken so as to eliminate the gas outburst danger. In aspect of extraction of borehole layout and extraction forms,the stereoscopic gas extraction modes are formed with combing with the ground drilling extration and downhole drilling extraction, pressure relief extraction and extraction in advance, crossing borehole and bedding borehole, extraction before mining and extraction in the process of mining. Combined with the different ventilation modes of different coal seam working faces, the significant effect of the gas extraction is obtained and the goal of safe and efficient mining of the mine is achieved.

Key words: Gas extraction, Protective layers mining, Ventilation pattern