Abstract: In order to reduce effectively ground subsidence and surface cracks in mined-out areas of coal mines, and utilize comprehensively coal gangue and fly ash of coal-fired power plants, this paper took the coal mines and coal-fired power plants in the Qipanjing mining area for example, developed the filling material for coal mine gob made of fly ash and coal gangue in the Qipanjing mining area, and put forward filling technology and implementation process of gob and retaining gateway in fully mechanized mining. The results showed that the large amount of coal gangue and fly ash were in Qipanjing and its surrounding areas, whose composition was conducive to the filling materials. The strength of the filling materials maded of coal gangue and fly ash from Qipanjing was between 8~15 MPa, which could meet different filling requirements, and the comprehensive utilization of coal-based solid waste was more than 80 %. The low-strength filling material used in the goab and the high-strength filling one used in the side of the gateway along the gob could saved the control cost, be conducive to the rapid filling, and realized the full consumption of coal-based solid waste such as fly ash and coal gangue in Qipanjing mining area.