「道」是儒道思想的共通慧見。本文嘗試在前人的基礎上，從「道」的字源、字用與思想內涵上提出論析。在研究步驟上，除了「前言」、「結論」外，在本文章次安排共分三節：「道的素樸義」、「當代學者對道的語義解析」、「道的形上義理之詮釋」。在道字的字義探源部分，共獲得四個論點，分別為「走在關鍵的決策」、「生命道路的通達」、「高瞻遠矚的智慧」、「內外辯證的實踐」說明人生的道路上，有各式各樣的選擇，具有高瞻遠矚的智慧並且實際去做，使自身的生命或他人的生命達到互相通達的可能性，由此呈顯「道」字的豐富義蘊。另一方面，透過當代學者對道字的語義解析，將「道」歸納出三點義涵，分別為第一是「形而上之道」，指出道體，無形無象，卻真實恆常存在，它是萬物的根源，先天地而生，長養萬物卻不主宰；其次是「變動規律之道」，指出道提供了循環往復、變化相反的自然法則。最後是「生活處世之道」，說明道透過實踐方能對人產生影響力，可為世人指引生命的方向。

The shared wisdom of Confucianism and Taoism is Tao. Based On the previous researches, this study enquires into the origin, the usage, and thought content of the word Tao. In the research step, in addition to ＂ntroduction＂ and ＂Conclusion＂, the interpretation of this article is divided into three sections: ＂In Simple and Unadorned Meaning of the Tao＂ and ＂What Tao Means in Lao Tzu＂ and ＂Explanation of the metaphysics Tao＂. This study reaches four conclusions: ＂Decided at a critical moment＂, ＂Smooth life＂, ＂Thinking very deep intelligence＂, ＂The realizing of internality becomes outside experience＂. This is the abundant meaning of Lao Tzu's Tao. On the other hand, Tao has triple meanings in Lao Tzu: ＂Metaphysics Tao＂ is invisible yet claims eternal existence. It exists anterior to the earth and the sky, nurtures every creature without dominating it. ＂Tao of Regular Change＂ provides the physical law of Tao. In ＂Tao of Daily Life,＂ Tao produces its influence through practice, and guides directions for humans.