Some of the online resources of the National Digital Library are completely free and can be used directly through the network without a reader's card, but most of them can only be used directly in the library and can only be retrieved outside the library, and the full text can be obtained through document delivery.

Readers who need a deposit card are mainly for those who need to borrow books, and non-Beijing readers do not need to apply.

Digital library is very different from physical library, and it must be a digital resource before it can be used. At present, there are many digital periodicals, dissertations, patents and other resources, but few digital books.

There are many digital libraries in China. Recommend the joint reference and document delivery network of Zhongshan Library. Registered users can get free document delivery. /