简要地回顾美国图书馆自动化系统(LAS)的发展历史,介绍美国LAS市场现状,包括市场收入、高校图书馆、公共图书馆和中小学校图书馆LAS市场。以几个较有名的大型系统为例,分析美国LAS中一些值得我们借鉴的特点,并从三个方面具体阐述美国LAS的发展趋势——正向适应数字图书馆的系统转变。 Briefly review the development history of Library Automation System (LAS) in the United States and introduce the current status of the LAS market in the United States, including market revenue, university libraries, public libraries and the LAS market of primary and secondary school libraries. Taking several famous large-scale systems as examples, this paper analyzes some characteristics of LAS in the United States which are worth learning from, and elaborates the development trend of LAS in the United States in three aspects-that is, a positive transition to adapt to the digital library system.