In view of heat dissipation existed in the high-power LED light ,an optimization de-sign was applied to the radiator of the high-power LED with a shroud under the air-cooling condition .A fluid analysis software was used to optimize the internal diameter and height of the shroud ,the diameter of the inlet and the angle of the heat sink's fins w hile the parameters of the fin structure were fixed .By changing these parameters ,the parameters of the gas on the surface of the heat sink were changed in fluid shape and wind speed ,and finally the convective heat transfer coefficient of the fin was changed .Through optimizing ,a series of optimum pa-rameters belonging to the shroud and the heat sink were obtained :the shroud's height was 85mm ,the inlet diameter was 76 mm ,the outlet diameter was 83 mm and the angle of the heat sink was 9° .It is concluded that the temperature of the heat sink has a certain degree of reduc-tion after optimization ,w hich can provide an optimized scheme for the cooling design of high-power LED lamps .%针对大功率 L ED 光源存在的散热问题，在风冷散热条件下，对加装导流罩的大功率L ED散热器进行优化设计。在肋片结构参数固定的条件下，利用流体分析软件对导流罩的内径、高度、进气口直径以及散热器肋片夹角进行优化。通过改变这些参数来改变散热片表面气体流体的流形、风速等值，最终改变肋片表面对流换热系数。获得的导流罩和肋片夹角参数：导流罩高度85mm，进气口直径76mm，出气口直径83mm，散热器肋片夹角9°。通过优化使散热器温度有一定程度的降低，为大功率L ED灯具散热设计提供了一种优化方案。
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