AbstractSince the semiconductor LED light source has many advantages, such as small volume, low power consumption, high brightness, low heat, environmental protection and so on, is considered as the lighting source will be following the incandescent lamp, fluorescent lamp, high intensity discharge lamp after the fourth generation light source. With the LED in lighting applications increasingly urgent demand, LED lamp heat dissipation problem is getting attention. LED downlight as a broad prospect of application in the lighting, the heat dissipation problem is an important problem in the process of product development. Because of its heat dissipation space is limited, the weight of the radiator can not too large. In addition to consider its reliability and cost factors, this article proposed based on micro heat pipe solar flowers radiating structure, designed to overcome the conventional radiator profiles of relying solely on the natural convection diffusion heat in large defects, at the same time, reduce the weight of the radiator. Through the numerical simulation method to study the central diameter, environment temperature, bottom hole, the fin height and the number of fins on the performance of a heat sink effect. The simulation results show that, in the research range of parameters, sun flower structure of radiator can meet the cooling requirements of LED article will early in the numerical simulation on the basis of the study, according to LED road lamp heat radiating structure optimization design. According to the design result, finally determined to meet the requirements of the LED road lamp heat radiating words: LED; lighting; heat transfer; numerical simulation希望能过帮到你