Hello, kiss! The way to know your reader ID number is as follows: 1. If it is a virtual reader ID and has been logged in through the mobile service platform before, you can log in automatically through the mobile platform, and then the reader ID number will be displayed. 2. Mobile platforms such as WeChat have been logged in. You can log in to official website of Shenzhen Library by scanning the code. After logging in, the reader ID number will be displayed in the upper right corner. Expansion: When readers need to cancel the reader's card or cancel the borrowing service function of the reader's card, they can go to the main service desk on the second floor of Shenzhen Library manually. Self-service accreditation machines and self-service library do not accept cancellation of readers' cards. Before going through the formalities, the reader must return the borrowed documents and settle the overdue fees and other fees in the reader's card, and handle them with the reader's card and his valid certificate. When the reader's card is cancelled or the borrowing service function of the reader's card is cancelled, the corresponding book borrowing deposit and pre-deposit will be returned to the reader; If it is handled on its behalf, valid certificates of the person and the agent shall be issued.