To improve the cooling capacity of light emitting diode (LED) lamps, a new type of LED lamp radiating structure is designed based on the principle of the chimney effect. A three-dimensional model is built by SolidWorks, and its plug called Flow Simulation is used to simulate the model build. The highest temperature of LED chip is 81.34 ℃ when the power is 10 W. When the power is increased to 15 W, the highest temperature is 105.54 ℃, and it is higher than the security temperature (80 ℃) of LED chip. An improved scheme of adding the honeycomb radiator in the middle of the substrate is proposed. Which reduces the highest temperature of the LED chip by 30.54 ℃, and the optimization experiment is carried out. The results show that when the type of honeycomb is regular hexagon, the length of honeycomb is 6.0 mm and the thickness of the honeycomb is 1.0 mm, special-shaped LED lamp has the best heat dissipation effect. The highest temperature of LED chip is 74.47 ℃ and radiator mass is 47.19 g. When the power is 8, 12, 15, 18 W, the highest temperatures of the LED lamp meet the safety requirements. The accuracy of the study is confirmed by the experiment of 8 W special-shaped LED lamp samples.