Abstract: Based on the characteristic of flat seam in Shendong Mining Area, taking Daliuta Coal Mine Huojitu Shaft as a model coal mine, the calculation of grouting parameters of flat seam was studied. The consequences showed that the preventive grouting should be carried out to the goaf when Shendong Mining Area mined the coal seam. Or else, when the underlying seam was mined, the overlying and the underlying goaf may be interconnected to cause the overlying goaf oxidized spontaneous combustion for the second time. Then coal mine would be affected by it. the grouting capacities of the open-off cut and stopping line triangle regions of 12313 fully-mechanized face were both 9 162 m³, the grouting time were both 152.7 hours; the grouting capacities of the two crossheadings that from the open-off cut to the 300 m ranges and from the stopping line to the 300 m ranges of 12313 fully-mechanized face were 18 383 m³, the grouting time were 306.4 hours.