The reader ID number of Wenzhou Library is a personal identification number, which is used to verify and manage the identity of readers. It is usually distributed to readers by library staff according to their personal information and requirements when they apply for library cards. Readers can use this account to log on to the online library system of Wenzhou Library for book inquiry, borrowing and reservation. The specific allocation method and format of the reader's ID card account number may be different. I suggest you consult the relevant staff of Wenzhou Library or consult official website of Wenzhou Library for accurate information.