Abstract: In order to study the improvement method of rockburst prevention and pressure relief effect, as well as the allocation problem of rockburst prevention and pressure relief level in high and low stressed zones, we established a universal applicability division discriminant and carried out a series of experiments for the high and low stressed zones respectively. The experimental results and theoretical analysis indicate that the effect is limited to use large diameter borehole drilling of just single round in high stressd zones, and its strength should be 3 times as high as the low stressed zones. The increase of single hole drilling cuttings weight can increase the broken zone radius of the hole and then enhance the pressure relief effect, we can take appropriate measures to increase coal mass vibration and increase the amount of drilling in the process of pressure relief. The effect of interval time for several rounds is better, due to stress accumulated rapidly in the coal after pressure relief.