本文係利用燒結式均熱板內部之熱質傳三維模擬分析，探討毛細結構對燒結式均熱板散熱效能之影響。本文首先構建均熱板內部具有毛細力效應之多孔性介質及雙相流相變化熱傳之三維數值模型，並加以模擬分析，分析結果指出，均熱板的確具有良好的溫度擴散效果，可以有效避免熱點(hot spot)現象的產生。其次更進一步探討毛細結構厚度、孔洞係數、以及均熱板厚度等參數。分析結果顯示，孔隙度係數在0.5以及毛細結構厚度在0.9mm時，均熱板有最低的熱阻值。本文結果可提供各種熱傳改良或散熱裝置設計之參考。 In this paper, the heat transfer efficiency of wick structure inside the sintered heat spreader is studied by three-dimensional numerical simulation of two-phase flow and porous media mode. At first, the three-dimensional numerical model of heat spreader with porous media is built and analyzed for phase change heat transfer of two-phase flow and capillary effect of wick structure. As a result of simulation, it shows that heat spreader has excellent ability in heat spreading without heat spot phenomenon. Furthermore, the design parameters of heat spreader are studied, such as thickness of porous media, porosity, and thickness of heat spreader. From these analyses, it shows that there is the lowest thermal resistance in heat spreader with thickness of 0.9 mm and porosity of 0.5. The result of this paper can be the reference for the modification and design of heat dissipation.