The article mainly discusses tunneling when there is more gas in the coal layer,utilizing the hish layer cracks using the hole in the high layer,in this way of inhaling the next layer gas as tunneling,the problem of the gas consistency above the ordinary level in some workplace because of the gas gushing form the next layer is sloved.

Based on grey relation theory,a mathematical model of coal seam gas emission and its contributing factors has established.

Forecasting of Gas Emissions Based on GM(1,1) and Realizing It by Computer;

Relationship between selection of coal mining technology and prevention of gas emission and coal spontaneous combustion;

The preventive measure for the gas emission and law;

Research on determination of chaotic characteristics of gas gush based on time series in excavation working face of coal mine;

Complexity and measurement of complex degree of gas gush in heading faces of coal mine;

Aimed at the gas gush change law of every construction craft in the blasting driving face,the appropriate measure is adopted for gas comprehensive management.

The gas discharge volume of Daxing Coal Mine Sv712 fully mechanized face during working time had reached 120 m3/min.

Excavation speed was often effected because of gas rapid discharging after firing gas discharge went beyond the limit,and hidden danger was formed.