The author of this book is Lu Ban, a legendary carpenter in the Spring and Autumn Period. His family has been carpenters for generations, so influenced by their elders, Lu Ban and Xiao Ban are not only skilled, but also rich in practical experience. Tools such as ladders and saws were invented by Lu Ban.
Lu Ban's book is divided into two volumes. The first volume is about serious carpentry. This is technical, but the second volume is more mysterious, with spells and spells. It looks strange, but it is said that there is no specific practice method in the book, and the teacher must teach it by hand. The strangest thing about "Lu Ban Shu" is that it is clearly mentioned in the book that learning "Lu Ban Shu" is bound to face the lack of a course, either one's body is damaged or one's family has an accident. In a word, learning Luban's book costs a lot.
According to legend, Luban was called to work by the state because of his exquisite skills. At this time, Luban's wife happened to be pregnant, and the couple had a good relationship. Soon they left. In order to welcome his wife, Lu Ban made a wooden kite. As long as Lu Ban says a spell here, the wooden kite can fly to Lu Ban with his wife. On one occasion, Lu Ban's wife also learned this spell from Lu Ban. The wooden kite took off as scheduled after the spell ended, but it didn't take long before the spell failed because of blood, and the wooden kite fell from the sky, killing Lu Ban's wife and the child in her belly.
Because of this, Lu Ban was so disgusted with his invention that he put a spell on it. As long as he studies Lu Ban's books, he is bound to face a situation where there is none. This matter sounds mysterious and impossible to prove.
Of course, in addition to this story, there is also a saying that the first volume is to teach carpenters skills, and the second volume is to teach carpenters to protect themselves. So the first volume is to teach skills, and the second volume is to teach spells and spells. In ancient times, craftsmen's status was not high, and they were often bullied by employers. Therefore, in order to make their descendants live with more dignity and respect, Lu Ban deliberately left the next volume, so that those who have learned Lu Ban's book can protect themselves after learning it. Therefore, there is a saying among the people that you should not provoke carpenters if you provoke anyone. According to legend, he only needs to draw a few spells to make the house collapse instantly.
So in general, the main reason why this book was banned is probably feudal superstition, especially the second half, whether the content is true or not, is out of date, so it was banned.