China is one of the most serious countries in coal and gas outburst in the world,gas outburst prediction is the key technology of gas control,and the critical value of gas outburst prediction index is very important parameter to decides whether regional control of gas outburst is effective or not.In order to study the evaluation index of the regional drainage of No.3 coal seam in Sihe mine,based on the gas outburst integrative theory,the residual gas content,residual gas pressure and their relation of origi...