Abstract: Bedrock has a great impact on the production process and the safety of personnel and equipment. In order to reduce or eliminate the bedrock，taking open-pit bench excavation blasting as the research object，the generation mechanism of blasting bedrock phenomenon are analyzed. Combined with specific cases，LS-DYNA numerical simulation software is used to analyze different factors，and the most intuitive display is given through the effective stress curve. It is found that in a reasonable range，reducing the hole network parameters，setting the ultra-deep，and increasing the aperture can reduce the root rate.

Key words: open-pit blasting, blasting bedrock, preventive measure