According to the historical records of China, the notebooks of the Ming Dynasty were called hand boards, jade boards or decorative boards, also called water boards. It is a tool for ancient officials to go to the temple to face the monarch. In ancient times, when the ministers of civil and military affairs appeared in front of the king, they held a water bowl in their hands to record the king's life or will, and they could also record the words to be played to the king on the water bowl to prevent forgetting.