本文先透過論述「天」概念之沿革，說明「天」概念，如何從「禘」概念轉向「天」概念，而發展出「天命靡常」理論，藉以確立周朝合法性與政權輪替的基礎。孔子時期，對「天」概念的再次詮釋，提出「天命」概念。至〈性自命出〉成書時期，再次開展出，「性自命出，命自天降」論述，說明「性」概念的根源與出處問題。藉此闡述，〈性自命出〉中，「天」、「命」、「性」三者之關係。

In this paper, we will first talk about a transition from the doctrine of ＂Di＂ to the doctrine of ＂Tian＂. Having overthrown the Shang Dynasty, founders of the Chou Dynasty had to justify their right to rule. Consequently they developed the doctrine of ＂Tian Ming Mi Chang＂. During the time of Confucius, the doctrine of ＂Tian＂ underwent a re-interpretation by the doctrine of ＂Tian Ming＂. Since the Xing Zi Ming Chu had been written, the doctrine of ＂Tian＂ had the other transformation and the explanation for ＂Xing Zi Ming Chu Ming Zi Tian Jiang＂ proceeded which presented the origin for the doctrine of ＂Xing＂. Then we will discuss the relationship between the doctring of ＂Tian＂, ＂Ming＂ and ＂Xing＂ in the Xing Zi Ming Chu.