Abstract: In order to prevent the adjacent mine fire areas from affecting the safe production in Bandingliangta Coal Mine, a fire stopping was successfully built at the field boundary of Bandingliangta Mine by using gob 3D laser scanning technology, drilling holes from surface, grouting plastic water glass gel and filling material. The isolation effect of the fire zone was investigated by analyzing the change trend of gas temperature and CO concentration in the borehole. The result showed that the gas temperature in the test hole in the isolated area dropped from 66℃ to 36℃, and the CO volume fraction decreased from593×10^-6 to 34×10^-6. This fire area isolation technology effectively prevented the fire propagation from the stripping and excavation area in Zhujiagou Mine to Bandingliangta Mine.