Abstract: In view of the difficulty of spontaneous combustion in gob during the backout period at large dip angle fully-mechanized working face, this has the characteristic of internal and external air leakage in goaf. The super high-water material, which has the characteristics of high crystal water, adjustable gelling time, strong permeability and condensation body, high inerting properties and wettability for coal, etc, successfully controls coal spontaneous combustion due to long time stopping coal mining in the 9421 gob of Zhangshuanglou Coal Mine by using the comprehensive fire prevention and control technology of superhigh-water material, decreases significantly the CO concentration between the supports and return air at working face and guarantee the safety backout at working face.