The fire protection system is an important infrastructure to ensure the safety of the city, and the fire hydrant pump is an important part of the fire protection system. When a fire occurs, whether the fire hydrant pump can provide sufficient fire extinguishing water is directly related to the fire fighting effect and personnel safety. Therefore, the reasonable determination of the flow rate of the fire hydrant pump is of great significance to improving the fire fighting ability of the fire protection system and ensuring the safety of the city.