隨著資訊科技及網路科技的發展，出版也跟著多樣化，近幾年來尤其是從美國提出NII計畫後，出版品的儲存形式不再拘泥於印刷方式，電子出版品的蒐集使得各國國家圖書館相當頭痛，為達時代性任務必須緊迫追隨技術發展的腳步，將圖書館的工作做適度的調整；由於各國國家圖書館對於國內書刊資料的收集多採呈繳制度，因此，對內必須修訂館藏發展政策作為應變的根據；對外必須修訂呈繳的法源，以支持館方徵集工作的順利推動。本文將以日本國立國會圖書館為例，探討電子出版品的呈繳。

　　The proliferating development of information technology and network stimulates publication technology, electronic publications in an age in which information is increasingly communicated and stored in electronic form, library should adjust its policies and processes accordingly. Because of most national libraries use legal deposit to acquire materials published countrywide; therefore, to revise the acquisition policy is a must, and it is definitely required to promote the revision of deposit law to support the acquisitions. This paper introduces the legal deposit system of electronic publications of the National Diet Library of Japan.