Abstract: In order to investigate the stress distribution and the gas content change in the surrounding coal of roadway along gob, we investigate the relation between drilling cuttings weight, gas pressure and ground pressure by using the theories of rock mechanics and elasticity and based on the field experiment in the return airway of 15091 face of Guhanshan Mine. Meanwhile, with the relevant formula and the analysis of drilling cuttings weight, we obtained mine safety width of stress relief zone and distribution of stress; the width of stress relief zone is about 12 m, the location of stress concentration region is from 12 m to 25 m, the location of original stress zone is beyond 25 m. Finally, combined the stress values and the changes of gas content in the coal, the coal in the stress concentration region is damaged, and the pre-exhaust gas roadway width should be 15 m or more.