Indoor fire hydrant system is the most common building fire extinguishing facility, with simple operation and good fire extinguishing effect. However, from the inspection of public gathering places, the situation is not optimistic, there are many problems, and the intact rate of indoor fire hydrant system is very low. Once a fire breaks out, it can no longer play a role, so we must attach great importance to it. It should be checked as an important content of fire supervision and inspection, so that the indoor fire hydrant system can fully play its role. Gas fire extinguishing system is a relatively advanced fire extinguishing system, which requires a large investment. Generally, it is set in advanced places that need local space protection, and also involves public gathering places, such as museums, large libraries, ethnic ancient buildings and other places.