关于中国唐宋以降历史的时代区分,20世纪初日本学者内藤湖南的“唐宋变革说”产生了广泛的影响,并引起日本国内热烈争论。内藤此说传到美国之后,又引起新一轮的质疑与深入探讨,并提出新的研究模式。“宋元明移行期”的提出即是在此研究基础上的深化。本文将首先介绍内藤湖南唐宋变革观;其次结合日本国内宋史研究,略述西方史学界研究唐宋变革的基本模式的变迁;最后讨论日、美有关“宋元明移行期”的相关论述。 Regarding the distinction of the time between the decline of the Tang and Song dynasties in China, the Japanese scholar Naito Fujio of the early 20th century made a wide-ranging impact on the reform of the Tang and Song Dynasties and caused heated debates in Japan. After Naito’s remark to the United States, it raised a new round of questions and in-depth discussions and proposed a new research model. “Song Yuanming transition period ” is proposed in the deepening of this research. This article will first introduce the Naoto Lake South Tang and Song Dynasties change of outlook; secondly, combined with Japan’s domestic history of Song Dynasty, the history of Western historians to review changes in the basic pattern of change; the last discussion of Japan and the United States related to the “Song and Yuan Dynasties transition period,” the relevant discourse .