To address the issue of low efficiency in deep hole cutting, it was proposed to use layered charges in cutting holes. Firstly, the influence of hole-inner layered charges on the rock breaking and cavity forming effects of deep hole cutting was theoretically analyzed. Then, numerical simulations were carried out using SPH-FEM algorithm to reveal the processes of rock breaking and throwing and the mechanisms of rock breaking and cavity formation. Finally, field tests were conducted to explore its application effects. The results show that the hole-inner layered charge could realize the uniform distribution and release of explosive energy, which could eliminate the upper large rock and weaken the constraint effect from the bottom surrounding rock, so as to achieve the cavity formation efficiency of 96.5 %. The SPH-FEM numerical simulation realized the visualization of the blasting process, and the simulation results confirmed the beneficial effect of uniform energy distribution and sequential release on rock breaking and cavity formation. Compared with traditional cutting blasting technique, using the hole-inner layered charge cutting technique, cycle footage and hole utilization were increased by 0.45 m and 17.3 %, respectively, the specific charge was reduced by 0.42 kg·m-3. The results demonstrated the applicability of hole-inner layered charge cutting technique in deep hole blasting.