Abstract: Taking high gas and extremely close distance coal seam group as the background, in this paper, the risk factors of spontaneous combustion in composite goaf of high gas mine are studied, and the dynamic closed-loop control technology system of composite goaf is proposed. On the basis of monitoring, dynamic regulation of gas extraction, high and low joint grouting for the residual coal in the key area and the large and full cross-sectional curtain nitrogen injection, a closed-loop control system for monitoring, regulation and governance is formed.