天臺智顗圓融哲學的根本教義便是其「實相」理論。他以「一念三千」、「三諦圓融」的「性具說」為一切諸法的真實體相。通過研讀其佛學巨著《法華玄義》，本文意欲從智顗的相即體系入手，具體探討其揭示事物屬性及其相互之間的關係所用的八種概念，以展示其圓融哲學功用性特色。

The theory of the ultimate truth can be regarded as the fundamental doctrine of the prefect and merging philosophy of Tiantai Buddhism. Zhiyi presents his theory of the “three thousand dharmas in one instant thought” and “perfect and merging three fold truth” as the real substance of all dharmas. With the inspiration of studying his comprehensive work The profound meaning of the Lotus Sutra, this paper intends to explore in detail zhiyi’s system of identification in terms of eight types of concept in revealing the nature of things and the relationship among things, so that the dynamic feature of his prefect and merging philosophy can be demonstrated.