图书管理基本业务活动包括：一本书的采编入库，清除库存，借阅和归还等。采用B-树（4阶树）对书号建立索引，以获得高效率。-Library Management basic business activities include: editing a book storage, inventory clearing, borrow and restitution. Using B- tree (4 TREES) ISBN indexed to obtain high efficiency.