After reunification, Qin Shihuang believed that he had contributed to the Three Emperors and Five Emperors, and adopted the titles of "Emperor" of Huang San and "Emperor" of the Five Emperors. He was the first monarch to use the title of "Emperor" in the history of China, so he called himself "the first emperor". At the same time, the central government implements three public officials and nine ministers to manage state affairs; Partially abolish the enfeoffment system and replace it with the county system; At the same time, books are the same language, cars are the same track, and unified measurement.

Attacking Xiongnu in the north, conquering Baiyue in the south, and building the Great Wall of Wan Li; Build a canal to connect the Yangtze River and the Pearl River system. However, in his later years, Qin Shihuang pursued immortality and dreamed of immortality. He abused the people, stifled their wisdom and shook the ruling foundation of the Qin Dynasty. Before 2 10, Qin Shihuang died in Xingtai sand dunes on his way eastward.

Qin Shihuang laid the basic pattern of China's political system for more than 2,000 years, and was praised by Li Zhi, a thinker of the Ming Dynasty, as "an emperor through the ages".

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Before Qin Shihuang unified the six countries, he paid attention to the rule of ethnic minorities in southwest, southeast and northwest regions, thus strengthening the political and cultural ties of a multi-ethnic unified country dominated by the Chinese nation. After reunification, officials were set up in the southwest minority areas to make them a part of Qin State. After the Qin Dynasty destroyed Chu, it further unified the southeast Yue nationality area, and established Minzhong County (now Fuzhou, Fujian) in the land of Dongou and Minyue.

Subsequently, Qin Shihuang ordered Tu Youyou to lead a 500,000-strong army south in five ways, going deep into today's Hunan, Guangdong, Jiangxi and other places. At the same time, poor people, mothers-in-law and Jia people who were heavily in debt were sent to support the war, and finally South Vietnam and Ou were unified, and Nanhai County, Guilin County and Xiang County were established. Since then, these areas have become the territory of Qin.