After the people passed the customs, the rulers of the Qing Dynasty fully accepted the Confucian thought of "benevolent governance", and Emperor Kangxi greatly praised Mencius' exposition that "benevolent people are invincible". He said: "The benevolent is invincible, and this is king. Instead of abusing power for personal gain, practicing fraud and talking nonsense, not being king and not fighting, the enemy soldiers will be defeated. The word king is the beauty of the art of war. " He realized that whether the war is won or not and whether the state power is consolidated, the most fundamental factor is neither the quality of weapons and equipment nor the danger of the city, but politics. Therefore, he stressed: "The way to govern the world lies in the gains and losses of political affairs." Emperor Kangxi believed that the peaceful people in Xiu De were the greatest politics. From the lessons of the ups and downs of the past dynasties, especially the demise of the Ming Dynasty, he realized that "water can carry a boat and also overturn it" and realized the importance of people's hearts. Only by implementing benevolent policies and appeasing the people can we get the support of the people. Without the support and support of the people, the country cannot be stable and the political power cannot be consolidated. In the 30th year of Kangxi (169 1), Cai Mao, the general of Gubeikou, joined the army. Someone suggested repairing the collapsed Great Wall. However, Emperor Kangxi said, "Emperors rule the world for their own reasons. They don't just rely on obstacles ... to defend their country. But in Xiu De, when the people are happy, the country will win and the border will be stable. The so-called unity is strength. "

The thought of cultivating morality, caring for the people and Ben Gubangning became an important guiding ideology of national defense construction in Qing Dynasty. Since Qin and Han Dynasties. The nomadic people in the north invaded the south continuously, which posed a great threat to the Central Plains dynasty. Building and defending the Great Wall has become an important measure to eliminate border disasters in past dynasties. The Ming dynasty spent a lot of manpower and material resources to build the Great Wall, which had a certain defensive effect on Mongolian cavalry, but the border troubles from the north were consistent with the Ming dynasty. From the very beginning, the rulers of the Qing Dynasty gave up this traditional "wall-building" mode of national defense construction. As early as the post-Jin period, Nurhachi took Huairou Mongolia and Lian as the national policy and actively strived for the submission of Mongolian nobles. After the people died, the rulers of the Qing Dynasty adopted the policy of taking Mongolia as the Great Wall in the process of unifying China and governing the border areas, that is, giving favors to Kharka Mongolia, appeasing and enslaving Mongolian princes and nobles through marriage, reward and relief, and winning the hearts of the people. The Qing dynasty did not station troops in Mongolia, but relied on the strength of Mongolian princes and nobles to maintain social order in Mongolia and defend the northern border of the Qing dynasty. Emperor Kangxi said: "In the past, Qin Xing built the Great Wall with earth and stone, and I went to Krka, Shi Si to guard against the north, which was better than the Great Wall." He also said: "Han people ignore the Tao, but it is far from being soft." There is no border defense in the DPRK, and the Mongolian tribe is the screen. " This policy successfully relieved the worries of the Qing Dynasty about looking north, not only created conditions for the reunification of northwest Xinjiang, but also built a solid Great Wall to contain the invasion of Russia. Later, Yong Zhengdi and Emperor Qianlong not only completely inherited and developed the idea of "regarding Mongolia as a screen vassal". They treated the local nobles in Tibet and the nobles in Junggar and Uighur with affection and courtesy, and made them "Huaide Thanksgiving" (Volume 5 of Tales of the Qing Dynasty), thus forming a frontier composed of Kharka Mongolia, Inner Mongolia and Junggar.