最初人为农牧分界线的确立

实地考察和对比研究中发现了阴山赵长城与秦汉长城之间的本质性区别。阴山赵长城的特殊地理位置和建造地形证明它不具备完整的军事防御功能。赵国的发展历史说明，阴山赵长城出现在中原农耕势力向北开拓疆战过程中，在力量对比悬殊的情况下修筑长城时，地理上更多考虑了可耕土地的括入问题。所以赵国北长城没有突破土地和农业意识，在天然农牧分界线上建造了人为农牧分界线。赵国北长城标志着中国古代农牧界线的一次大变动，它在中国古代历史上产生了极其深刻的影响。

The Earliest Establishment of the Artificial Demarcation Line Between Agriculture and Animal Husbandry

: After the On-the-sport investigation and comparison research, we have found the basic differences between Zhao Great Wall and Qin-Han Great Wall along the Yinshan Mountains.The special geographical position of Zhao Great Wall along Yin shan Mountains and the topography on which it built shows it did not have a complete defensive function. The development of the history of Zhao State shows that the Zhao Great Wall appeared during the period when the farming force in the central plains expanded its area northward. When there was a great disparity in strength, Zhao Great Wall was built mainly in the consideration to include more arable land. So, there was not a break through in the idea of land and agriculture Zhao Great Wall was built. Therefore it marked the artificial demarcation line between agriculture and animal husbandry. Zhao north Great Wall marked a big change in the demarcation line between agriculture and animal husbandry. It produced a far reaching influence in ancient China history.