Filling mining is a common technology for coal mining under buildings. On the basis of analyzing paste filling mining, this paper puts forward high concentration cemented filling which fits modern Chinese coal mine production and studies high concentration cemented filling material for coal mining emphatically. Through analyzing and testing the slurry concentration, mixture amount of cement and burning ash’s impact on the properties of filling materials, the paper concludes the concentration and mixture ratio of the components of high concentration cemented filling materials for mine production, develops the additive composition and its dosage. Through ring pipe test, the filling materials’ transportation resistance loss was tested. All the above tests show that high concentration cemented material is: low transportation resistance, no bleeding, high filling body strength, good integrity and stability, solidification time 6 hours and strength is beyond 4Mpa after 28 days.