Abstract: The occurrence of rockburst was resulted from the sudden burst of energy accumulating in the rock mass.Direct calculation methods were applied for the judgment for energy of rockburst.Research and analysis show that engineering excavation depth is the main external cause, and that rock compressive strength is the main internal cause.Combining these two factors, energy formula of rockburst is created from the perspective of energy and two coefficients of energy formula are inferred by dimensional analysis.Based on energy formula of rockburst, applicable conditions of energy formula and judgment for rockburst by energy are further stated.Firstly, the results of this formula in practical engineering prove that this formula is reliable.What is more, it is found that engineering excavation depth is inversely proportional to the coefficient（k）of energy formula .Finally, it is obtained that the deeper engineering excavation depth becomes, the greater the influence on rockburst is.

Key words: Rockburst, Energy, Engineering excavation depth, Rock compressive strength