Bu Jiang Zong baiyuan zhuan 補江總白猿傳, a masterpiece of the earlyTang chuanqi 傳奇 fiction, was written by an anonymous author whose identity has yet to be uncovered. The anachronism found in the text plays an important role, converting the historical facts into a fictional account. In the text, the correspondences between history and fiction are systematic. It resembles a labyrinth with an inner structure in which historical authenticity and creative fictionality shift back and forth. This is achieved through a complex system of displacements and replacements. This paper argues that the anachronism in Bu Jiang Zong baiyuan zhuan is more likely an intentional method of composition rather than the result of careless mistakes. The practice of interweaving nonfiction and fiction into the same text suggests that the author was attempting to establish a referential framework for the story. An in-depth exploration of the mechanics of intentional anachronism in Bu Jiang Zong baiyuan zhuan is conducted in this paper, and the result will become part of a larger project that studies the development of chuanqi fiction as a whole.