Abstract: Automated rock drilling equipment can realize mechanical and automatic blasting technology in medium and deep hole tunnel, precise and rapid construction, improve the working environment and improve the construction progress.Cutting is the key in tunnel blasting excavation.It controls blasting effect and determines economic benefit.Based on the practice of Tongzi tunnel No.3 inclined shaft project, the influence factors of multi-stage wedge-shaped cutting in large section, medium and deep holes are analyzed by grey correlation method.The results show that five related factors, small and medium cutting, have the greatest impact on cutting blasting and the smallest impact on ultra-deep cutting, which provides a reliable theoretical basis for cutting optimization of blasting excavation in similar projects using XE3C automatic three-arm rock drilling trolley in the future.basis of chemical transformation.