Seal script, one of the ancient Chinese characters, also known as seal script, is a general term for ancient Chinese characters. "Seal makers spread it, spread its physics, and apply it endlessly." The ancients thought that seal script was written by Cang Xie, but this is not credible. The generation of a kind of writing needs a long development process, and it is impossible for a person to complete it in a short time.
Broadly speaking, seal script includes all the characters before official script and their extended genera, such as inscriptions on bronze inscriptions, Shi Guwen, ancient prose of the Six Kingdoms, seal script of Xiao, seal script of Miao and overprint. In a narrow sense, it mainly refers to Da Zhuan and Xiao Zhuan. The font of seal script is round and the structure conforms to the meaning of six books, so Sun said in the Tang Dynasty, "Seal script is graceful and smooth".
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Since the Han Dynasty, it is generally believed that Da Zhuan was written by Zhou Xuanwang Taishi Zhuan (827 BC). For example, Hanshu has 15 history books, and Ban Gu notes: "Zhou Xuanwang wrote 15 seals." Xu Shen also said: "Wang Xuan wrote fifteen pieces of Da Zhuan, which is different from ancient Chinese." Ancient Chinese or others, that is, Taishi increased and lost ancient Chinese, so Dazhuan is also called "Zhu Wen". Therefore, later generations all think that Da Zhuan is a form after ancient prose.