本研究主要目的在於了解國家圖書館之參考諮詢服務政策及讀者資訊需求。首先由文獻了解影響各國國家圖書館服務改變之因素，再透過文獻及網站內容分析，瞭解各國國家圖書館對於服務對象之界定，以及參考諮詢服務範圍。本研究以大英圖書館、美國國會圖書館、澳洲國家圖書館及我國國家圖書館為對象，由政策中分析比較，國家圖書館對於服務對象與範圍之界定。並藉由分析我國國家圖書館不同年度之參考諮詢問題，以了解讀者資訊需求類型，由不同年度之比較，了解讀者的資訊需求變化。根據研究提出結論與建議。本研究建議如下： 一、 國家圖書館應訂定並公開參考服務政策 二、 除訂定主要讀者群，應依不同對象及主題特質，實施分群服務 三、 除一般諮詢服務，可提供預約制服務，或以收費方式提供研究型服務 This research is aimed to explore the nature of reader service at the National Central Library, including the reference service policy and the information needs of users. Through examining the documents, this study introduced the factors underlying the evolvement of state-owned libraries across the world. In addition, this research noted how the national libraries worldwide identify their reader groups and the way they depicted the territory of reference service. This part of task was accomplished by the operation of documentary analysis and content analysis of websites. This research examined and noted the similarities/differences of the polices made by the major libraries –including the British Library, the Library of Congress, the National Library of Australia and the National Central Library. Aside from the above approach, this study also tried to outline the reader information assortment by analyzing questions asked by users visiting the National Central Library throughout different years. The conclusions are listed as follows: 1. The National Central Library should institute its reference service policy and make it known to the public. 2. In addition to servicing the main target of clients, the Library should offer divided services according to different reader groups and subjects. 3. Aside from the general reference service, the Library could provide reference appointments or paid services for research-oriented cases.