Zhang Xu, whose real name is Gao Bo, was born in Wu Jun County, which is known as Zhang Changshi. His date of birth and death is unknown. Originally from Suzhou, he served as a county magistrate in Changshu. Great calligrapher of Tang Dynasty. It is famous for cursive writing. His cursive script, Li Bai's poems and songs, and Pei Min's sword dance are also called "three wonders". The Complete Poems of Tang Dynasty recorded six of his poems. See Book of the New Tang Dynasty, Volume 202, with Biography of Li Bai.
His calligraphy originated from the "two kings", which can be original and innovative. His regular script is accurate. The rules are extreme, and Huang Gu is called "the first in the Tang Dynasty". If his regular script is more inheritance than creation, then his cursive script is a great innovation and development in calligraphy. Han Yu said, "Xu is good at cursive writing, but he can't cure his book." Change is like ghosts and gods, so don't be arrogant. " Du Fu wrote in Song of the Eight Immortals: "Zhang Xu's three cups of grass are sacred. He waved his paper like a cloud before taking off his hat to reveal the top of the maharaja. " He can sublimate the art of calligraphy to the artistic realm of expressing calligraphers' thoughts and feelings with abstract points and lines. In the art of calligraphy, his handwriting seems strange but not strange. The key is that the pen for stippling completely conforms to the traditional rules. It can be said that he used traditional techniques to express his personality and became a creative calligrapher worthy of his own time in calligraphy. Broad, fresh and unrestrained, far more than the previous calligraphers' works, with a strong flavor of the prosperous Tang Dynasty.