Public libraries follow the principles of equal utilization and public access. Public library service experiences several development stages in the history of China and western countries, from conservative to open, from serving for special people to serving for the public, and from serving passively to serving actively and serving extensively. Extension service expands the service range and it is a necessary road to realize public library for the people. 24 hour self-service library is a kind of extension service which is embedded in public 24 hour life. It increases the visibility of services and satisfaction of public library readers, and it is an important manifestation of public library extension service in modern society.%公共图书馆遵循平等利用、公共获取的原则.在中西方公共图书馆服务史上,经历了从保守到开放、从只为特定人群服务到为普通民众服务、从被动服务到主动服务和延伸服务的发展过程.延伸服务扩大了公共图书馆的服务范围,是公共图书馆真正实现"民享"的必然之路. 24小时自助图书馆将服务嵌入社区民众24小时生活当中,它提高了公共图书馆读者服务的可见度和满意度,是公共图书馆延伸服务在当代的重要表现.
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