永定河发源于山西宁武管涔山天池,流经山西、河北、北京和天津,在北京境内长159.5公里,坐落在永定河洪积冲积扇上的北京城,它的变迁发展是与永定河的河道移动密不可分的,它对于北京的政治、文化、军事、交通、古村落、宗教都有着重要的影响,被称为是北京的母亲河。近年来随着对永定河及周围文化的研究深入,学术界提出永定河文化的概念,已经出版了多种学术著作和论文。2006年我馆征集部开始对北京的工业遗址进行调查,其中,对于永定河上的古桥研究就这个项目的一个重要课题。卢沟桥和三家店是永定河上的古渡口,它成为出京西南下北往的交通枢纽,卢沟桥距北京市 The Yongding River originates from the Tianchi Lake in Guanziyang Mountain, Ningwu County, Shanxi Province. It flows through Shanxi, Hebei, Beijing and Tianjin. It is 159.5 kilometers long in Beijing and is located in Beijing City on the alluvial fan of the Yongding River. Its development is related to the Yongding River The river movement is inextricably linked. It has an important influence on Beijing’s political, cultural, military, transportation, ancient villages and religions. It is known as the mother river of Beijing. In recent years, with the further research on the Yongding River and the surrounding culture, the academic community has proposed the concept of the Yongdinghe culture and has published many kinds of academic works and dissertations. In 2006, the collection department of our library began to investigate the industrial sites in Beijing. Among them, studying the ancient bridge on the Yongding River was an important issue for this project. Lugou Bridge and Sanjiaodian are ancient ferries on the Yongding River, which has become a transportation hub to the northwest of Beijing to the north. The Lugouqiao is away from Beijing