The hidden danger caused by the oxygen and coke of fuel in the fuel supply pipe increases with the rise of temperature on the entrance of the combustion chamber of aviation engine. In this paper a thermal protection that uses air heat shield and ″oil cooling″ is designed for a certain center-leveled and multi-point injection fuel supply system,and the effect is analyzed by numerical simulation. The study shows that in the typical high temperature condition, the air heat shield structure can lower the temperature of the wetted-wall fuel pipe below the critical temperature of fuel coking; when the mainfuel in idling rating stops to supply fuel, the sole air thermal protection cannot meet the design requirements without the ″oil cooling″ program.