This thesis is written for the purpose of draw a cnclusion from below.
⑴ After the Qing Dynasty(淸朝) entered Shanhaiguan, the Dynasty, appointing the capitulating generals of the Ming-dynasty(明朝) including Wu Sangui(吳三桂), sends troops to Zhongyuan(中原) to sweep the group against the Qing dynasty. As the large scale of people go outside at once, the region of Shengjing(盛京) is evastated apace. But because the Qing Dynasty is absorbed to solidify the rule of Zhongyuan, it has no time to manage the region of Shengjing. After the region of Manchuria became gradually stable, the Qing Dynasty launched a reconstruction policy to restore the devastated cradle of Dynasty. It continued the two dimension at large, the one is the Law of Summoning Farmers to Cultivate the Liaodong District(遼東招民開墾令) being put a law into effect in the reign of Shunzhi(順治年間), the other is resettle in Manchuria(撤藩) policy being pushed ahead after Kangxi Emperor‘s personal control of the empire.
⑵ But Three Feudatories(三藩) rised in revolt against this resettle in Manchuria policy, then the Qing Dynasty cannot but adjust the policy of the region of Manchuria. For counteracting Three Feudatories, the Qing Dynasty puts a large scale of troops to the southern front lines, conscripting to the region of Manchuria, for that reason the military setup of Shengjing became hollow temporarily. Like this, as soon as the military gap stands out, the state of affairs surrounding Shengjing also begins to be in confusion. In Inner Mongolia(？蒙古) Chahar Mongols(察哈爾部)’s Buerni(布爾尼) submiting to the Qing dynasty revolts against the Dynasty, and in the Joseon Dynasty(朝鮮) a hard-liners against the Qing Dynasty emerge and insist an expedition to conquer the north(北伐論). The most necessary problem is how the Qing Dynasty defends Shengjing from this military threat of surrounding areas.
⑶ As soon as the Qing Dynasty seizes the chance to victory in the war of Three Feudatories, the Dynasty starts rehabilitation plan of Shengjing. Repressing the Revolt of the Three Feudatories(三藩之亂), Shengjing is exposed to a direct military threat of Chahar Mongols and is plagued by rumors that the Joseon Dynasty prepares an expedition to conquer the north. So the Qing Dynasty focuses on the organizing and expansion of military preparedness in the rehabilitation plan, especially the plan takes concrete shape to the deportation of ‘New-Manchu’ Niru(‘新滿洲’ 佐領) and the placement(安？) of the Three Feudatories’ military. In other words, on the hand, the Dynasty puts ‘New-Manchu’ Niru on the Dynasty’s subject register, giving ‘New-Manchu’ Niru a fief, on the other hand, placing(安？) the Three Feudatories’ military replace the operation of Fortification System(驛站). Thus, as the Qing Dynasty reinforces the ruling system over Shengjing, the administrative district broaden to a buffer zone or the area that relatively does not be controled. Therefore this change is a new and great threat to the Joseon Dynasty bordering Shengjing. At last, the incident of border transgression(犯越) between the Qing Dynasty and the Joseon Dynasty is creating a boundary problems beyonds diplomatic friction.