按需打印是出版行业的～次革命性变革，它使出版的形态发生变化，将对图书馆的未来发展产生重要影响。对于读者服务来说，自动印书机（EBM）的打印目录数据库增加了读者获取文献的渠道，其运用使读者能够根据需要自我汇编图书并打印。对于图书馆文献收藏策略来说，EBM＋PDA模式将图书馆员从以往的揣测式采访的困境中解脱出来，使购买的文献就是真正流通的文献。但EBM存在价格昂贵、作者和出版商认可程度不高、没有配套适用的著作权法及相关法律等问题。%Print on Demand brings revolutionary changes to publishing industry and makes changes in the form of publication, it will influence the development of libraries in future. For readers, the print directory database of Espresso Book Machine （EBM） has increased the channel of acquiring literatures of readers, the use of EBM makes readers compile and print books according to their needs. For the collection strategy of literatures in libraries, EBM＋ Patron Driven Acquisitions （PDA） mode relief librarians from the speculated acquisition, realize purchase literatures which are circulating literatures really. But there are also many problems, such as expensive, the low recognition of readers and publishers, the lack of applicable copyright laws and relevant laws. And so on.
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