本研究以美國三大國家圖書館之一：美國國家農業圖書館為例，探討其做為一個專業的農業圖書館，如何利用館藏資源，經過數位化的轉換過程，彙整農業研究、教育推廣與經濟統計等相關農業知識資訊，拓展其圖書館各項資訊服務的規劃與設計。本文首先簡介農業資訊推廣與傳播概念，並提出農業網路資源利用對農業傳播之影響，進而分析美國國家農業圖書館之數位資源設計，最後由農業資訊與鄉村發展之關係強調建置數位農業資源與圖書資訊服務增值之重要性，同時提出國內農業圖書館資訊提供與建置單位之參考建議。

The purposes of this study are to explore the design of National Agricultural Library (NAL) of United States Department of Agriculture (USDA) and to evaluate the communication effectiveness of its web resources. This paper first discusses concepts of agricultural extension and information communication as well as agricultural web resource application. It then analyzes the design of web resources on the NAL website. Finally, it concludes with the importance of constructing and adding values to digital library resources to expand the impacts of agricultural information on rural development. Also, some suggestions for researchers and practitioners in this field are proposed to help improve effectiveness of agricultural information communication in Taiwan.