《西遊原旨》係清代全真教道士劉一明對《西遊記》之詮評。他利用轉譯的方式將取經四眾、妖魔精怪、神祇護法等，全都賦予內丹意涵。本文以妖魔精怪作為討論主體，從劉一明的內丹架構出發，觀察其如何轉換小說與內丹兩種截然不同的類型。

"The Fundamental Purport of The Journey to the West", written by Yi-Ming Liu - a Quanzhen Taoist in Ching Dynasty collects Liu's explanatory comments to "The Journey to the West". By Liu's unique interpreting way, all the demons & spirits characters in "The Journey to the West" are endowed with "Nei-dan" (Inner alchemy) meaning. The principal discussion of this essay, originates from Liu's "Nei-dan" theory and observes how he interprets novel into an entirely different expression style - "Nei-dan" is focused on the study of demons & spirits described in the story.