| Ming Great Wall was another defensive project since the Great Wall had been built by the first emperor of Qin dynasty. In order to strengthen the defense of the Great Wall and troops for commanding and deploying along it. Ming dynasty set up nine defensiveareas-----nine important border towns along the Great Wall one after another. Each townwas led by the total soldier. One of the major town—Datong was the key of border fort and the barrier to guard the capital. During Ming dynasty, Datong town had been important military base to defend itself against Mongolian aristocrats, and it played a important role in the northern border defense of Ming dynasty.Experienced several hundred years, city wall, pier , castle of the defense of the Great Wall gradually disappearedwith the times developed. The auther tries to research the Baihu Fort in order to comment on the defensive services of Dangtong town, deepen the research of northern border town, defense, ethnic relation of Ming dynasty and widen the research of the regional history of Datong town. Meanwhile, it can cause deep thinking on the protection of the Great Wall.The article firstly outlines the foundation of Datong town and its status in the northern border defense of Ming dynasty, Sencondly, it takes the Baihu For for example to introduce the construction of the defensive project for the Great Wall. Thirdly, according to the inscriptions remains in the Baihu Fort, it analyses the regional history of Datong town and identifies the building time of "Yongning monument" in the Fort. Finally, from incident of Bahannaji surrendering to Ming in Baihu Fort to the "Anda reward tribute"—a transformable sign of the relation between Ming and Mongolia, the function of the Datong town had transformed since it. |