《九成宫醴泉铭》是唐贞观六年（632）由魏征撰文、书法家欧阳询书丹而成的楷书书法作品（碑刻者不可考）。现存于陕西麟游县碑亭景区 。
《九成宫醴泉铭》叙述了“九成宫”的来历和其建筑的雄伟壮观，歌颂了唐太宗的武功文治和节俭精神，介绍了宫城内发现醴泉的经过，并刊引典籍说明醴泉的出现是由于“天子令德”所致，最后提出“居高思坠，持满戒盈”的谏诤之言。
《九成宫醴泉铭》结体修长，中宫收紧，四边开张，左敛右纵，化险为夷。字形随势赋形，左右结构作相背之势，上下结构上窄下宽，间架开阔稳定，气象庄严。其布白匀整，字距、行距疏朗，为九宫最准者，全碑血脉畅通，气韵萧然。
《九成宫醴泉铭》是欧阳询晚年经意之作，历来为学书者推崇，视为楷书正宗，被后世誉为“天下第一楷书”或“天下第一正书”。
“Jiucheng Palace Li Quan Ming” is a regular script calligraphy work written by Wei Zheng and calligrapher Ouyang Xun in the sixth year of Tang Zhenguan (632). It is now in the Beiting Scenic Spot in Linyou County, Shaanxi Province.

The Ming of Li Quan in Jiucheng Palace recounts the origin of “Jiucheng Palace” and the grandeur of its architecture, eulogizes the martial arts, culture and frugality of Emperor Taizong of the Tang Dynasty, introduces the discovery of Li Quan in the palace city, and cites ancient books to explain that the appearance of Li Quan was caused by “the Son of Heaven orders virtue”, and finally put forward the admonition of “living high and thinking low, keeping full and keeping full”.

“Jiucheng Palace Liquan Ming” has a slender structure, the central palace is tightened, the four sides are open, the left is closed and the right is vertical, and the danger is saved. The shape of the shape is shaped according to the situation, and the left and right structures are opposite to each other. The upper and lower structures are narrow at the top and wide at the bottom. The space between them is open and stable, and the weather is solemn. Its layout is white and even, and the word spacing and line spacing are sparse and clear. It is the most accurate one in the nine palaces. The blood of the whole tablet is smooth, and the charm is faint.

The Ming of Li Quan in Jiucheng Palace is Ouyang Xun’s deliberate work in his later years. It has always been highly praised by scholars, regarded as the authentic regular script, and praised as “the first regular script in the world” or “the first regular script in the world” by later generations.

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