Wang Xizhi, the sage of calligraphy, is famous for his masterpiece "Preface to the Lanting Collection", which has been compared to "the best running script in the world". It is peaceful and natural, with euphemistic and implicit writing style, beautiful and strong. Zhang Xu, Caosheng, "Four Notes on Ancient Poems", wrote the work with great force, pouring down the force, and the writing was graceful and free, rippling in a comfortable rhythm with urgency and slowness. His calligraphy is unrestrained and bold, and his strokes are continuous and dangerous. The beauty of cursive writing actually lies in the fact that it can be done easily and in one go, giving people a sense of joy. Huai Su's "Zi Xie Tie" has been talked about by calligraphy enthusiasts for more than 1,200 years since the middle of the Tang Dynasty. Use the center stroke to create large strokes with pure momentum, such as "a sudden rain and whirlwind, the whole hall is full of momentum", to the state of "suddenly three or five screams, filling the wall with tens of millions of words". Yan Zhenqing, "In Praise of the Portrait of Dongfang Shuo", the calligraphy is bold and vigorous, and "Manuscript of the Nephew Memorial", the whole text uses a slightly bald pen, with round and strong brushwork, like a flowing seal script, from beginning to end, although the ink is replenished due to dryness. , due to the pause, the ink color initially became black and gray, thick and withered, and changed many times, but then it was completed in one go. Liu Gongquan, "Diamond Sutra Engraved on Stone", is meticulous in his writing, and his strokes are thin, powerful and graceful; the structure is well-organized, taking the shape vertically, constricting the middle palace, spreading out in all directions, fresh and powerful. "Liu Gu" can be first recognized here, and Liu's collection of books can also be known here.