Before And After The 2nd Century Bc, The Qin And Han Dynasties Northwest Frontier And Its Effects,

The frontier defense of northwestern China in Chin & Han dynasties that abolished in B.C 200 is inherence and initiation of ancient China civilization. It is also be concerned with nation relation and geographical politics of the special period. The scramble between Huns and Han Empire about the Great Bend of the Huanghe River is not only the adjustment of the balance of their strength, also the internal request of the supplement which agricultural cultivation and nomadic economy. The dividing of geographical unit and economic region lead to the political district's compartmentation and consolidate. The frontier defense system the Great Wall, migration and soldiers is not only the vindicator of empire spirit but also the witness of cultural exchange between hinterland and frontier, east and west.