Abstract: To Study the geological evaluation of underground hydraulic strengthening gas drainage, for example of Zhongmacun Mine, on the basis of geological unit division, combined with the fuzzy mathematics theory, a fuzzy mathematics hydraulic strengthening gas drainage geological evaluation system and methods are established to analyze and evaluate gas drainage units in Zhongmacun Mine, and we get the evaluation coefficient of each gas drainage unit, and point out that roof is shale with thick coal and stability, resource-rich, simple structural conditions, and if gas drainage geological unit evaluation coefficient is greater than 1.88, then you can use hydraulic fracturing to carry out gas drainage development. And selecting drainage unit (Ⅰ₄-Ⅱ₂) with the evaluation coefficient of 2 to test, the results showed that the effect of gas drainage unit of evaluation guidance by hydraulic strengthening is remarkable, and gas drainage scalar after hydraulic strengthening is 7 times than that before hydraulic strengthening.