Abstract: In order to study the reasons and preventive measures of dynamic disasters such as shock bump and the destroy of rock mass in mining engineering resulted from the outburst of mash gas and coal during mining, stress-relieving measurement and temperature and confining pressure calibration were made with improved CSIRO cells at 4 measurement points in Datong mining area. Based on the measured results the in-situ stress tensor of each point was computed by a special computer optimization program, and the relationship between in-situ stress and geological structure was analyzed with the geological structure factors of the mining area. The rules of in-situ stress distribution and the relationships between in-situ stress and geologic structure in Datong mining area were obtained.