Abstract: According to the proldem that the spontaneous combusted coal rejects dump would send out the harmful gas to pollute environment and could have expl osion dangers, thus a comprehensive fire distinguishing was conducted to the serious spontaneous combusted coal rejects dump in Xiqu Mine in order to purify the envi ronment and eliminate the danger purposes.The comprehensive detection technology with the infrared temperature measurement, multi parameters gas detection and b orehole temperature measurement was applied to determine the fire distribution at the east side of the coal rejects dump with an area of 650 m2.An rational layout of gr outing boreholes, grouting parameters determined, fly ash from coal-fired power plant and the new fire prevention and control material was applied to the fire extinguish ing with grouting.The fire prevention and control results showed that the CO volume fraction in the coal rejects dump was reduced from 840x10-6to 12x10-6, the H2S v olume fraction was reduced from 89x 10-6closed to 0 and the sO2volume fraction was 0.The surface temperature of the coal rejects dump and the local temperature wa s the same and the internal temperature was reduced from 420 °C below to 80 °C.Those results could meet the requirements stipulated in Disaster Prevention and Contr ol Standard of Coal Rejects Dump in mine.