Abstract: The largest mining depth is more than 1 000 meters in Hongyang Coal Mine, and burst dynamic disaster is more and more obvious. For the sake of understanding the mechanism of the dynamic phenomenon, the burst tendency test of 7^# coal seam and roof is used by RMT-100 rock mechanics testing machine. The result shows that the impact energy index of coal seam is 1.553, elastic energy index is 2.586, dynamic damage time is 221.25 ms, the determination result is weak burst tendency, and the total bending energy of roof rock is 532.08 kJ with strong burst tendency, the uniaxial compressive strength of coal has positive correlation with impact energy index and elastic energy index respectively, and has negative correlation with the dynamic failure time.