As a writing tool for Chinese characters, the pen has the advantages of small size, convenient carrying, convenient writing, durability, and the written characters are not easy to fade. From an aesthetic point of view, although the line expression and artistic appeal of pen characters are not as rich as brush calligraphy, they are far better than other hard pens such as pencils and ballpoint pens, because the nib is elastic and the strokes written are the same thickness.