Bibliographic retrieval, periodical name retrieval, overdue announcement, new book notification, new book subscription, reader login, etc. Upon inquiry, the customer service staff of Jinpan Library learned that the Bibliographic Retrieval System of Jinpan Library provides matching methods such as bibliographic retrieval, periodical title retrieval, overdue announcement, new book notification, new book subscription and reader login. The public retrieval system of Jinpan Library is also called OPAC, which means "online public retrieval catalogue". The company's OPAC products have built-in self-service business modules, which keep readers indoors.