Documentary books need to be written in sequence when they are signed one by one, because the purpose of signing is to record everyone's attendance and ensure the authenticity and integrity of the event. However, in some special cases, the order may be adjusted according to specific needs, such as being absent in an emergency and then signing. In short, it should be written in order to ensure the accuracy and reliability of the signature. At the same time, in the process of writing, we should also pay attention to clarity, standardization and seriousness, and try to avoid signature errors or omissions, so as not to cause unnecessary trouble to the follow-up work.