台灣地區自2001年頒佈「石油管理法」後完全開放石油產品進出口，台塑公司正式投入量產(2000年)後，國內各類油品大多供過於求，其中汽柴油出口量更是逐年增加，顯示油公司積極開拓國際市場。而持續成長之出口量與出口國，亦反映台灣地區汽柴油於國際市場之競爭力。

　　本研究以固定市場占有率(Constant Market Share)模型，分析2001-2005年台灣地區汽柴油出口市場之競爭力，研究對象以台灣地區主要汽柴油出口計14國為主，以中華民國出口貿易統計月報中汽油(海關編號2710001100-4)及柴油(海關編號2710003200-9)出口數據進行實證研究。

　　研究結果顯示2001-2005年間，在大多數國家中，影響台灣地區汽柴油出口成長之主要因素為成長效果。在競爭力變化上，2005年台灣汽柴油整體出口市場以新加坡、菲律賓及越南為前三大具競爭力之市場，且菲律賓及越南仍有成長潛力；而南韓及香港市占率快速遞減，顯示台灣汽柴油出口至此兩地區之競爭力正逐漸衰退。整體而言，市占率變化可反映台灣出口汽柴油至各國競爭力之消長。

　　After implementation of The Petroleum Administration Law in 2001, the oil market in Taiwan is fully liberalized. The introduction of Formosa’s refining business in 2000 has resulted in significant oversupply of oil products for domestic market, especially for gasoline and diesel oil. Thus, the oil companies have to develop foreign markets. Accordingly, The growing export quantity and export markets, reflected the Taiwan’s competitiveness of gasoline and diesel in the international market.

　　This study applies the Constant Market Shares (CMS) model to analyze the export competitiveness of gasoline and diesel during 2001-2005. Fourteen major markets (countries) are scrutinized. The data of the gasoline (Custom No. 2710001100-4) and diesel (Custom No. 2710003200-9) are from The Export Trade Statistical Report of Taiwan.
　
　　Research results indicate that the most significant effect in most markets is the Growth Effect. As to the variation of competitiveness, Taiwan gains competitiveness in Singapore, Philippines and Viet Nam in 2005. However, the decline market share in South Korea and Hong Kong revealed Taiwan’s competitiveness is fading. Furthrmore, the variation of export growth can reflect the change of competitiveness to some extent.

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