Abstract: In view of the present situation of coal panels under buildings occupies a large proportion in Gushuyuan Mine of Jincheng Coal Group, first, we investigate and analyze the potential of filling materials around Jincheng city, and analyze the elements of the raw materials. We ultimately determine to use the coal gangue, fly ash as the main ingredient of paste-like filling material, mineral powder, lime and gypsum as gelling material. Then, we carry out three factors three levels orthogonal experiment, use the range analysis to choose the result of experiment, determine the ratio of main ingredient of paste-like filling material, that is coal gangue∶fly ash =2∶1. Follow, we study the gelling material ratio, test the exudation rate of this material, finally, we conduct outdoor large volume consolidation test, drilling cores to process the cores into standard cylindrical specimens, and test the mechanics performance of specimens under uniaxial and triaxial compressive test.