Research Of Da Dong Great Wall Defensive System

After the establishment of the Ming dynasty, Northern border has always been the key question concerning the ups and downs of the Ming dynasty, So a series of military town was set along the northern border of the Ming dynasty, The strategic position of Datong town is particularly important in the "nine side".Its special geographical position determines it has an important political and military position in northern defense system whose center is the capital.Datong is the most important position in nine military towns that is set in northern frontier. It is against Mongolia and protect the capital in the north,and in the south it control three frontier junctures and shield Taiyuan, liking "wings"'guard ancestral grave.What's more, with the shift of the strength of Ming and Mongolia, Datong gradually become the main area of their fight. With the progressive rise of Datong strategic position, its defense facilities become more and more,more and more complex, better and better,more and more scientific, and eventually formed a complete defense system whose center is Great Wall.At present, the research on the Great wall is mainly complanate, static, which is lack of overall, dynamic, three-dimensional research with respect to ending position, direction, length, via areas and so on. There has been few research about a defense system and mainly literature research, which is lack of powerful support of comprehensive and systematic archaeological fieldwork and the combining research of historical relics and extant ruins.It's more important that it is lack of"dynamic study" on defense system. We must know the defense system of the Great wall was not set up at once, which was built after the Founded, expansion, perfection and finally formed many stages.The paper is on the space-time background of Datongtong from Hongwu to Wanli period, Specifically, the "Event ofTuMuBu" and "Canonized of AnDa" is limited to,it discuss the development and change of the defense system of Datong town and is divided into before, during and after the period, that is,There are 7 stages in the construction of defense system,which is Founded in Hongwu Period, framework formation in Yongle period, the strenghth in Xuantong and Zhengtong period, Preliminary development in Jingtai and Tianshun period, Further development in Chenghua,Hongzhi and Zhengde period,the peak in Jiajing and Longqing period, and the final forming in Wanli Period. Based on the changes and existing status of the wall and castle of Great Wall,through the carding and analysis of historical materials and combination with the harvest of fieldwork, it outlines constructive,developing,and changing historic trial on the construction of Datong defense system.