A method of copying and learning predecessors' calligraphy. Put the tablet aside and write according to the strokes, which is called "face to face"; Cover the tablet with thin paper and copy it according to the trace, which is called "copying" or "shadow book" Pupils learn Chinese characters, using the little red book and copying it. The General Records of Dan and Lead quoted York as saying: "Copying two versions is different. Copying posts is like the studio of catalpa people, and the beams are awkward. Although there are guidelines, the association has been established and the weather has its own work. The post is like a pair of pheasants in Qi Fei, a green dog floating in the clouds, and a mighty Wan Li, each with its own interests. "
In the Southern Song Dynasty, Jiang Kui's "Continued Book Spectrum" said: "Beginners have to copy books, and it is easy to reach them." Also known as: "Linshu is easy to lose the position of the ancients, but it is more than the brushwork of the ancients; Copying books is easy to get the position of the ancients, but it loses the meaning of the ancients. Books are easy to enter, books are easy to forget, intentionally or unintentionally. "In addition to copying, there is also a method of" hooking ",that is, covering the inscription or the original with oiled paper, using extremely fine strokes to double-hook the handwriting under oiled paper, and then filling the blank space in the double hook with ink, which is called" hooking ".