本論文主要以《淮南子．原道》為本，闡述《淮南鴻烈》一書中自然思想的形上意涵，及其與環保哲學相關的重要理念。全文概分為三部分：壹、前言：說明關於環保理念 的重要哲學意涵與道家自然思想的相關性。貳、本論：分為四小節，一、擇要說明貫串《淮南子》全書中的自然思想；二、以〈原道〉為主，歸納並闡釋「道之原始」的五點存有論意涵；三、說明《淮南子》自然之道的實踐綱領；四、撮要表明《淮南子》書中的環境意識。 參、結論：總結前文，檢討與反省《淮南子》自然思想對當代環保哲學的重要參考意義與價值。

　　　　　This paper attempts to interpret the ontological meaning of the natural idea with regard to environmental philosophy. It is based on “Huai Nan, Yuan Dao” and is divided into three sections. Initially, it would like to explore the relationship between Daoism's notion of nature, “zi ran” and ideas in environmental philosophy. The second section includes four parts: a) An explanation of nature, “zi ran” in the “Huai Nan Zi”. b) Summarizing the main ontological characteristics of the Dao as “arche” in the “Yuan Dao” c) Introducing the practical aspects of nature, “zi ran” in the “Huai Nan Zi” d) Further explanation on environmental consciousness in the “Huai Nan Zi”. In conclusion, I would like to evaluate and reflect on all above interpretations. Then I would like to offer some references from the “Huai Nan Zi” for the consideration of modern environmental philosophy.