Abstract: In this paper, based on Six Manchu Historical Archives of the First Historical Archives of China, assisted with " The Archives in Qianlong’s palace," "Qingshilu" and other literatures, in Qianlong’s twenty-eighth year, the resettlement of Jingkou’s Hanjun was studied t, the immigration of Jiangning’s Mongolia banners to Jingkou was also explored, and the relation of vacancy of Hanjun and Xinjiang garrison was discussed, too. It revealed that the leaving-banner’s driving force of Jingkou’s Hanjun was the garrison of Yili, and it became a link of its military deployment of the country, at the same time the livelihood of the banner that existed a long time was disposed.