The inscription on Liquan in Jiuchenggong describes the origin of Jiuchenggong and the grandeur of its architecture, praises the martial arts and frugality of Emperor Taizong, introduces the discovery of Liquan in Miyagi, and quotes ancient books to explain that the emergence of Liquan was caused by "the son of heaven made virtue". Finally, the warning of "aim high, persevere and avoid surplus" is put forward.
Jiuchenggong Liquan inscription, slender structure, the middle palace tightened, open on all sides, left folded and right vertical, keeping the sun. The glyph is shaped with the trend, and the left and right structures are opposite. The upper and lower structures are narrow and wide, the shelves are stable and the weather is solemn. Its white cloth is uniform, and the word spacing and row spacing are sparse, which is the most accurate one among the nine palaces. The whole monument is full of blood and bare charm.
The Inscription of Liquan in Jiucheng Palace is a masterpiece of Ou Yangxun in his later years. It has always been respected by scholars as an authentic regular script, and it has been praised as "the first regular script in the world" or "the first official book in the world" by later generations.