Library has made "fine for overdue returning books payment", there is not only follow the law, but also contradict of real relationship each other between reader and library.

The influences of Past Due,Offset Time and Safety Time on the MRP logic model are analyzed in detail,which is in according with the international standard and practical demand.

According to the related laws and regulations in China, the authors point out that the implementation of the system of borrower overdue penalty is a piracy behavior in the library, which has no legal gist and surpasses related stipulations.