Abstract: According to the serious failure occurred in the-800 m level deep mine roadway of Yaoqiao Mine, a rock Kaiser effect measuring method was applied to t he mine ground stress measurement.With the six special direction sampling of the directional cores, the single plus stress value in each direction was obtained with the acoustic emitting experiments.The size and direction of the in-situ principal stress was obtained with the calculation.The results showed that the max principal stress of the-800 m level was 19.00 MPa and the level was a medium high stress zone. Certain structure stress was existed in the-800 m level.In comparison with the measured r esults between the-650 m level and the-850 m level, the-800 m as the boundary of Yaoqiao Mine was obtained.The overlying strata were mainly controlled by the struct ure stress and the strata below-800 m would be controlled by the self weight stress mainly.