Abstract: Rock gas outburst becomes more and more serious with the increase of mining depth. Its danger is neither inferior to that of the coal gas outburst,nor studied as fully as the latter. Based on the comprehensive analysis of the field observation and laboratory examination, outburst prediction has been made for the underlying strata, which are in the same gas and oil bearing section as the lattest outburst according to the geological survey. The prediction has been proved accurate by the engineering practice.