Abstract: In order to prevent outburst danger occurred in the seam gateway driving in outburst seam and to reduce the engineering workload of the outburst preve ntion measures, based on the fuzzy mathematics and multivariate statistical analysis theory, a mathematics model of the outburst prediction index sensitivity function W as established.The prediction index sensitivity was quantified and with the quantification and qualitative comparison analysis, the outburst prediction sensitive index wa s determined.The application practices in No.021710 driving face of a mine showed that the gas desorption index Oh2 of the drilling cuttings was more sensitive than th e drilling cutting index S.The index△h2 applied to predict outburst danger of the driving face could reduce the engineering workload of the outburst prevention and coul d realize the rapid and safe driving of the seam gateway.