Abstract: In order to improve the accuracy of the outburst danger prediction for the mining and excavation working faces in the serious outburst high stress and so ft B4 seam in Xinzhuangzi Mine of Huainan Mining Area and to reduce the engineering quantity of the outburst prevention measures, the outburst prediction sensitive in dex and the critical value of No. 56204 excavation and mining working face in B4 seam trial block was obtained with the theoretical analysis, the lab measurement and t est, and the site test combined research means.The drilling cutting value was 4.0 kg/m and the drilling cutting gas desorption index was 0.30 mL/ (g:min1/2) .With the a pplication of driving engineering in the 1 380 m gateway in the test area, the results showed that the accuracy rate of the no outburst prediction for the driving working f ace was 100%.And the index and the critical value set by the research was rational and effective and meet the actual conditions of the test area.