Abstract: According to classic curves of hydraulic fracturing test in coal seam and theoretical analysis,this paper obtained typical analysis curves of hydraulic fracturing test.Taking testing well in Southern Qinshui basin as the research object,the in-situ stress of coal seam is measured.The hydraulic fracturing test data were analyzed and studied by double logarithm method and root squaring method,the empirical value of in-situ stress in Southern Qinshui basin and the mutual authentication of the two methods are accurate and credible.The test results of coal-bed hydraulic fracturing provide a basis for coal-bed methane exploration,testing,discharge and mining operations process in late stage.