Abstract: By the similar proportion experimental simulation of the tunnel fire, in conjunction with the theoretical basis of relationship among pool fire mass loss rate, the heat feedback rate of fire plume and pool fire heat release rate, when the heights of ignition points are different, the paper analyzes that the impact and changing laws of the various of ignition points on the tunnel ceiling temperature, fuel mass loss rate, fire power, absorbing heat feedback and the ceiling flame impingement zone radius. The paper concludes that the fuel mass loss rate, the heat feedback and the fire power are increasing with the increasing of fire source height.