For the coal seam roof rock construction difficult parts, by single-hole blasting funnel test data collected under ideal blasting effect, then through explosive equivalent conversion, the field under the mixed loading emulsion explosive blasting parameters were calculated. Through the porous with the superposition of blasting funnel test, single hole blasting funnel test blasting parameters were corrected, reasonable specific charge, hole spacing etc. were settled, which could solve large block after explosion and the difficult explosion of bottom hole.