Abstract: In order to prevent mining face of thick soil and thin bedrock in Daliuta coal mine from support crushing and great flood, taking the mining face 22614 in Daliuda Coal Mine as the research object, the paper determined comprehensively that the reasonable support working resistance of mining face is 9 000 kN, through analyzing thickness variation of rock roof and covering terrain and building support-surrounding rock mechanical model of thick soil and thin bedrock, the mine pressure monitoring results show that underground pressure intensities and maximum working resistance are higher than rated working resistance, but in less than 10% of the normal range.Therefore,the determination of working resistance of support is reasonable,which is suitable for control requirement of the main roof.