Abstract: In order to study the "two-zone" height of soft overburden rock in high-intensity mining in Shajihai Coal Mine,a 3DEC three-dimensional numerical model was established based on a high-intensity mining face. The maximum and minimum horizontal principal stresses and the angle between them and the advancing direction of the working face were considered in the model. The numerical model was calibrated against the field measured data. The influence of mining height,dip length,strike length and mining rate on the maximum height of soft overburden "twozone" in high-intensity mining was evaluated. The numerical results show that the maximum height of soft overburden "two-zone" in the high-intensity mining has a positive correlation with the mining height,and has no obvious correlation with the dip length and advancing rate of the high-intensity mining face. The advancing distance of working face where the high-intensity mining face reaches the maximum height of overburden "two-zone" has a positive correlation with the mining height,and a negative correlation with the dip length and the advancing rate.