China is one of the nations that have grievous coal and gas outburst problems,gas outburst prediction is the key technology of gas prevention and treatment,moreover,the core content of outburst prediction is the sensitivity of indexs.In order to study the sensitive indexs and critical values of the NO.3 coal seam in Sihe mine,this paper utilized the geological structure control theory and geological evolution history,summarized the coalbed gas geology law and gas outburst characteristics of NO.3 coa...