Based on Igneous rock coalfield in Zhangcun Mine of Jizhong Energy,  combined with the magma eruption and formation mechanism of igneous rock, igneous rock interpretation experience was discussed, igneous rock on the impact of the original shape and quality of coal seam and magmatic intrusion area coal measures strata in seismic time section in phase axis change law of seismic wave characteristics were discussed, which basically realized accurate judgment of igneous rock area and settled the scope of the igneous rock strata, guided the mining area coal mining construction, summary of igneous rock explaining the principles and rules provided reference for the interpretation of the work.