The stability assessment methods of surrounding rock roof under blasting load depend on the independent threshold safety criterion about the single intensity factor

which are mostly qualitative analysis without considering the three elements of the blasting vibration

so this kind of methods has some shortcomings and the insufficiency in engineering applications. The response signals are got through the numerical model of the different surrounding rock classes under blasting loads. The time-energy density function was used to analyze the time domain and frequency domain characteristics of the response signal; and the integral of the time-energy density served as eigenvalue was used to assess the blasting vibration effect. The quantitative relationship between the time-energy density integral(TEDI)and the roof damage degree of surrounding rock set the stage for improving the early warning system of rock roof damage based on the wavelet theory.