Abstract: For the characteristics of the emission of high concentration of hydrogen sulfide, great harmfulness in fully mechanized mining face of Wudong Mine, the new technology for treating hydrogen sulfide by sectional water injection in “three pressure zones” of heading face is proposed. Using test methods and theoretical analysis, the principle of the treatment of hydrogen sulfide in the “three pressure zones” by sectional absorption liquid injection in head coal, sectional type water injection parameters in single hole, concentration calculation methods of sectional absorption liquid injection, the relation between hydrogen sulfide reducing efficiency and injection absorption liquid concentration in coal seam were studied; the technology parameters for controlling hydrogen sulfide by sectional water injection in fully mechanized mining face “three pressure zones” is explored. Field application research shows that the reduction efficiency of hydrogen sulphide from the coal mining machine was 75.3% after the utilization of sectional water injection technology in “three pressure zones” coal body in fully mechanized mining face.