Abstract: For the problem that the residual coal in goaf appears serious spontaneous combustion due to the slow advancing velocity, accumulated and large space float coal, frequent dynamic disasters during the period of Kouzidong Mine 111303 working face crossing fault. After the reduction of working face air volume, the working face of the negative pressure drainage and reinforcement of fire monitoring, the implementation of continuous nitrogen injection in goaf, increasing the number of hidden points grouting at high temperature, injecting liquid CO₂ to the working face frame, we focus on designated grouting and water, filling the Remy materials in the spontaneous combustion area, and each technology cooperates with each other, complements each other. Through analysis of the concentration of CO in upper corner, high level suction roadway and the key regions, we can get the residual coal spontaneous combustion has been well controlled, the monitoring indicators are in a reasonable range, which effectively guarantee the safety mining of 111303 working face crossing fault.