Abstract: The energy accumulation and its position are two main factors on judging the rock burst occurring. An energy density criterion to distinguish the danger of rock burst is put forward based on this assumption in this paper. The process of the energy accumulation and the effect of the intensity of stress wave pmax to the energy accumulation are simulated and analyzed by employing ANSYS/LS-DYNA，and the characteristic and the position of the energy accumulation are obtained. Research results show that：1) With the stress wave increasing the value of the Udmax is increasing. When the intensity of stress wave pmax increasing from 5 MPa to 20 MPa，the incremental value of the energy density is 2.007 MJ/m3 to 3.981 MJ/m3，incremental rate reaching 98%；2) Due to the impact of the distribution intensity pmax，with the stress wave increasing the position of Udmax moves to the inside of the roadway side. When the intensity of stress wave pmax increasing from 5 MPa to 20 MPa，the incremental value of energy density factor k is 1.384 MJ/m4 to 4.976 MJ/m4，incremental rate reaching 259%，which means the notable increase of the possibility of the rock burst.

Key words: stress wave, rock burst, energy density