With the widespread popularity of electric vehicles, electric vehicles and fuel vehicles are parked together in garages, but there is currently a lack of special fire protection design standards for electric vehicle garages. By analyzing the characteristics of electric vehicle fires, it is proposed that when designing the fire water supply for mixed garages of electric vehicles and fuel vehicles, appropriately increasing the fire duration of indoor and outdoor fire hydrant systems and automatic sprinkler systems can effectively prevent the re-ignition of fires. The automatic sprinkler fire extinguishing system adopts a wet system and quick-response sprinkler heads, and increases the water spray intensity and the action area, so as to achieve better fire extinguishing and cooling effects; The configuration criteria of fire extinguishers should meet the requirements of Class B fire medium-hazard level places and Class E severe-hazard level places, and the maximum protection distance should meet the requirements of Class B fire medium-hazard level; In order to reduce water spots damage, drainage facilities with appropriate drainage capacity should be installed. The results can provide a certain reference for fire water supply design in a similar vehicle garage.