Abstract：In order to reveal the mechanism and characteristics of the dynamic phenomena，large deformation and failure of the tunnel at Yanbei mine，Huating mining area，the in-situ stresses of Yanbei coal mine is measured by the hollow inclusion stress-relief method. The result shows that the horizontal in-situ stress is the major principal stress in this area，and the stress has obvious character of the tectonic stress. The major principal stress is between 14.1～16.88 MPa，and its direction is basically according with the tectonic conformation at the survey point， which is the direction basically normal to the strike of the coal seam and strata. The magnitude of in-situ stress is not high，but the difference between the major and minor principal stresses is great，which is 9.85～10.5 MPa. The in-situ stress field shows obvious inhomogeneity，which results from the affection of some factors，such as geological environment and its evolution，tectonic character，properties of coal and strata，and so on.
