Based on new roadway in Luning Mine affected by strong dynamic pressure, technology of large depth seam pressure relief in roadway roof with strong dynamic pressure was researched, which analyzed mechanism of cutting seam pressure relief, determined cutting seam roof height and selected explosion technology to release. At the same time, roadway deformation before and after dynamic pressure tunnel pressure relief and rock stability were monitored, and found out that effect of large depth of cut blasting seam pressure relief was obvious.