Some questions about calligraphy, I would like to ask why the paper will wrinkle after writing. Is there any good solution?

As the comrades above said, it has something to do with the dryness and wetness of the ink, so it is very important not to let the sun shine. It is also because your paper can't absorb ink. When the ink is left on the surface, it will disperse with the water. When the water dries, the ink will shrink, causing the paper to fold. Especially when thick ink is used, this problem often occurs, even if thick ink is used for high-quality rice paper, because rice paper can not completely absorb ink, and the ink will shrink when it dries. If thick ink is used, thick publicity may be better. Give it a try!