Li Ao was a Tang-dynasty man of letters and philosopher. Basic details such as his birth and death dates and native place are sparsely recorded in publicly available sources, and this entry makes no conjecture about them. Judging from the two works held in this collection, Li Ao's writing falls into two distinct orientations. The first, Record of Going South (Lai Nan Lu), is documentary travel writing that follows firsthand observation, recording the geography, customs, and people encountered on a journey southward; its language is plain and its narrative orderly, making it a practical example of the ancient travel-record tradition. The second, Record of the Extraordinary (Zhuoyi Ji), leans toward tales of the strange and miscellaneous notes, gathering marvelous anecdotes in short pieces rich in narrative interest. One factual and one fantastical, the two works show the range of the author's取材 between documentary record and unofficial anecdote. This collection classifies him under philosophical reading and documentary literature, precisely because his writing combines speculative interest with a spirit of factual record. Owing to scattered historical sources, Li Ao's overall life and intellectual development await further textual research; readers may approach his writing through the above two works from the angles of travel writing and note miscellany, and thereby understand its characteristics and documentary value.