秦汉时汉族的大患是匈奴,所以每年都要从中原派遣人批戍卒到西北边塞去戍守.转师馈饷,极为劳费。孝文帝时,晁错建议徙民实边,常居田作以备胡。这虽发原于实边一念,但却为后世屯田制度之所由起。汉武帝时桑宏羊请屯田轮台以东,始有屯田之名。其后郑吉以屯田定西域,赵充国、冯奉世、陈汤、甘延寿等以屯田吏士立了边功。于是才正式的成为国家要制。西汉未由于连年饥旱与战乱,人口大减。所以东汉初年不但边疆凋荒,三辅及中原内地也大感土旷 Han and Han nationality in the Qin and Han Dynasties is the Huns, so every year from the Central Plains sent troops to garrison to the Northwest Frontier to defenders .Goer transfer rates, very labor. When Emperor Xiaowen, Chao Cuo proposed resettlement of real people, often in order to prepare Hu Tian. Although the original hair on the real edge of a concept, but for future generations Tuen Tin system from the beginning. Wu Emperor Emperor Sang Yang Tun Tuntai please turn east, there is the name of Tuntian. Later, Zheng Ji Tuen Tin set the western region, Zhao Chongguo, Feng Fengshi, Chen Tang, Gan Yanshou et al. So it became the official system. Western Han Dynasty is not due to successive years of drought and war, population decline. Therefore, the early Eastern Han dynasty, not only the frontier wilderness, three auxiliary and the Central Plains mainland is also a big soil Kuang