Abstract: The in view of the western coal-filed mechanized mining caving face in steeply inclined, thick top coal caving and fully mechanized top coal caving emission with high concentrations of hydrogen sulfide, caused great harm to the particularity of the advance of working face pre grouting absorption fluid technology of sulfide hazard prevention and control. Based on hole sealing technology, note absorption fluid technology and injection of different absorption liquid parameters reduce the hydrogen sulfide test research, it is concluded that a for prevention and treatment of extra thick top emission technology of sulfide hazard. Field research shows that coal pre injection Wells stent coal absorbing liquid hydrogen sulfide reducing efficiency reached 74.6%, achieve good control effect of hydrogen sulfide.