[目的/意义]大数据开启了图书馆服务的一次重大时代转型，在这样的新环境下，应该对图书馆服务发展模式衍变有新的理解，在服务方式、内容与机制等多方面进行思考，用大数据的思维看待图书馆服务的变革。[方法/过程]依据大量的文献和事实，从图书馆服务功能的角度，对图书馆服务发展模式演进过程进行综合性分析，论证图书馆服务发展模式衍变的内在逻辑与外在基础。[结果/结论]根据新业态的产生路径，提出数据时代图书馆服务发展的两种新业态：基于数据挖掘的知识发现服务新业态和基于数据融合的创新性应用服务新业态。

[Purpose/significance] Big data has opened a major era transformation of library service. The big data thinking could be used to regard the revolution of library service and have a new understanding of the evolution of its development mode, especially thinking deeply about the pattern, content and mechanism and other different aspects of service in such a new environment.[Method/process] Based on a large number of documents and facts, this paper comprehensively analyzes the evolution process of library service development model from the function perspective of library service and demonstrates the internal logic and external basis of the evolution of library service development model.[Result/conclusion] According to the path of the new format, this paper puts forward two new formats of library service development in data-ages:a new format of knowledge discovery services based on data mining and a new format of innovative application services based on data fusion.