This page presents the full public-domain text of 《太上内丹守一真定经》 (catalogue ID DAO-1250) from the Daoist Canon（道藏）collection of AstrologyLib.org. Bibliographic record: dynasty 两宋 (约公元 960 - 1279 年); authorship as catalogued: 道家祖师传本 (宋元); source edition（底本來源）: 道藏源流考证题记. Stable URL: https://astrologylib.org/library/read/daozang/DAO-1250/. To cite this text, give the book title, dynasty, and author, and credit AstrologyLib.org as the digital-edition source. The classical Chinese text is in the public domain; AstrologyLib English translations are released under CC BY-SA 4.0 — attribute and share alike.