Fuel controlling switches for the commercial airplane controlled the fuel entering into the firebox of engine, which was the core part of controlling engine.The fuel controlling switches integrated the fire lamp in some airplanes, which reminds the aircrew to shut off the fuel controlling switches when the engine is on fire. This paper analyzes the shape of the fuel controlling switches, and develops the function and the design of the fire lamp of the fuel controlling switches for the designing and servicing airplanes.