In the Tang Dynasty, Han Yu said: "Zhang Xushan's cursive script can't cure his skills. He is embarrassed and pitiful, compassionate, resentful and yearning, drunk and upset, and has feelings in his heart." Looking at things, we can see mountains and rivers, birds and animals, insects and fish, flowers and plants, the sun, the moon and the stars, storms and fires, thunder and thunder, song and dance battles, the change of heaven and earth, which is gratifying and embarrassing, in one go, so Xu's Book Change is still unpredictable, so it is finally praised by future generations. "
Han Yu said that the aesthetic connotation and life of Zhang Xu's calligraphy not only show the feelings of the inner world, but also show the images of various changes in nature. While expressing his spirit and soul, he also hinted at the existence of all things that moved him and made him happy. So this word is not a symbol of concept, but a unit of life. The image implied between the lines is not the description of things, but the "artistic conception" of the blending of scenes. It likes music, dancing and enjoying the beautiful garden buildings. This kind of realm is unmatched by pens, pens and pencils in Europe.