淨明道是宋元時期興起的道教新派，以主張踐行忠孝倫常而求得道成仙為其教義特色。以往的學界一般認為，淨明道的忠孝學說受到了儒家思想的很大影響，但事實上，淨明道的忠孝實踐卻與儒家有著很大的不同，其實質是一種內丹修煉。本文所討論的，即是淨明道「忠孝內丹」的基本內容及其與儒家思想、傳統道教的聯繫和區別，希望藉此說明中華文化「天人合一」觀念的特殊運用。

Jingming Dao is a new sect of Taoism arose in the times of Song and Yuan dynasties, which is characterized by pursuing to become celestial beings through practicing some moral principles such as loyalty and filial piety. Most scholars think formerly that the theories of Jingming Dao about loyalty and filial piety are influenced by the Confucianism, but they are different widely from the Confucianism in fact, because their essence is a kind of cultivation for inner alchemy. What this paper discusses about is the basic contents of this special kind of inner alchemy, as well as the relationships and differences with Confucianism and traditional Taoism. We expect it can reveal the special use of the Chinese idea of “Unity of the Heaven and Man”.