A type of LED automobile headlamp radiating structure was put forward, which was mainly composed of a ventilation pipe and a non-leaf fan. The corresponding model was generated in SolidWorks and the thermal condition was calculated with FloEFD thermal simulations. Results showed that the LED junction temperature was 148℃. Adopting two improved schemes, which rectangular fins and the honeycomb structure were filled into ventilation pipe respectively, the junction temperature of LED headlamps decreased to 102.01℃ and 86.20℃ respectively. With the orthogonal experiment, the scheme of filling honeycomb structure indicated that the factors affecting the system heat dissipation performance were as follows: the cellular equivalent diameter, honeycomb type, filling length, wall thickness and ventilation tube length. Therefore, the optimal heat dissipation structure was obtained by the parameter value of this order. Simulation results showed that, after orthogonal optimization, the temperature of LED headlamps was reduced to 75.17℃, which further improved the heat dissipation performance of the whole structure. Finally, the relationship between the wind speed and the thermal structure’s substrate temperature was discussed. The result demonstrated that when the wind speed was lower than 5m/s, the temperature decreased sharply with the increase of wind speed, and when the wind speed was higher than 5m/s, the temperature descend trend was relatively slow.