Abstract: In order to solve the technical problem of preventing and controlling the spontaneous combustion of broke coal body in the fault-fold belt in the southwest of the Ordos Basin, this paper combines the experimental analysis and field application to analyze the performance of new water-soluble single-component solid powder fire-fighting materials under different water-material ratio conditions.And determines the optimum slurry ratio for coal spontaneous combustion inhibition process.The research results show that when the water-material ratio is 20:1, the material has the best fire-fighting performance.During the field application, the CO concentration in the hidden spontaneous combustion area gradually decreased from 146 ppm to 6 ppm, and the coal temperature decreased from 82℃ to 26℃.The hidden danger of coal body spontaneous combustion near the fault-fold belt has been effectively curbed.The promotion and application of the research results in this paper have certain technical support for the prevention and control of spontaneous combustion of broken coal body near the fault-fold belt.