Abstract: Taking on-line support pressure monitoring, microseismic monitoring, working face top corner gas emission monitoring and other methods, we study roof behavior characteristics and control of B₂ coal seam at the first fully mechanized caving face in Kuangou Coal Mine. The results showed that the first weighting interval of the main roof was 62.2 m, and upper part of working face pressure was more severe, coal caving property in the lower part of working face was poor, the lower part of the face by use of the roadway ahead of deep hole presplitting blast can not effectively solve the problem of hard roof, thus the practice of roadway blasting methods craft softening hard roof, after blasting process significantly reduced the intensity of the activities surrounding rock, weighting interval of working face was decreased from 28 m to 17.8 m, it was effective solution to safety problems caused by the hard roof.