Abstract: In recent years, it is an effective way to use gas-fired internal combustion engine to burn coal mine gas driven generator for power generation, and the design of fire water system for coal mine gas power generation project has always been a difficulty in design, this paper summarizes the design of fire water system for Coal Mine Gas Power Generation Project, and probes into the pain points, difficulties and solving methods of fire water system design for this type of project, taking a coal mine gas power station project design in Jincheng, Shanxi Province as an example, it provides the reference and the reference for the fire protection designer.