The Qin Dynasty (221-206 BC), when it first unified six countries, area of ​​the Qin dynasty was only over 2 million square kilometers. With Northern Expedition of Xiongnu and restoration of Hetao; after Baiyue's Southern Expedition, area of ​​the Qin Dynasty reached 3 million square kilometers. Tang Qixian's map of Qin dynasty included Yunnan-Guizhou Plateau, but not Jiaozhi. I've made some adjustments.

Han Dynasty (202-220 BC) At beginning of Han Dynasty, its territory was same as during early Qin Dynasty. Later, after Emperor Wu of Han Dynasty attacked Xiongnu in north, ruled western regions, and conquered South Vietnam, Korea, and Southwestern Yi, territory quickly expanded to about 6 million square kilometers. The Han Dynasty controlled western regions for a long time, reaching 150 years.

Western Jin Dynasty (265-316), after Western Jin Dynasty destroyed Wu in 280, its territory was about same as that of Han Dynasty, but slightly smaller than that of Han Dynasty. However, Western Jin dynasty had much less control over western regions than Han dynasty. The Western Jin Dynasty was also a unified dynasty, but due to its short existence and ongoing civil strife, its national power perished without being fully utilized.

The Sui Dynasty (581-618), in 589, Sui Dynasty destroyed Chen Dynasty and reunified China. During this time, area of ​​the Sui Dynasty reached over 3 million square kilometers. Since then, after Emperor Sui Yang's development in Hexi and Lingnan, area has reached 4 million square kilometers. The Sui Dynasty did not last long, but it laid foundation for prosperity of Tang Dynasty.

The Tang Dynasty (617-907), after founding of Tang Dynasty, completed unification of mainland in 628 with an area of ​​more than 3 million square kilometers. Subsequently, Eastern Turks, Xue Yantuo, Goguryeo, Gaochang and Western Turks were massacred, and area quickly exceeded 10 million square kilometers. However, Tang Dynasty rule in desert lasted only 35 years. During reigns of Emperors Xuanzong and Wu Zetian of Tang Dynasty, Turkic state was restored, and area of ​​the Tang Dynasty stabilized at 6 million square kilometers. After Anshi Rebellion in 755, territory of Tang Dynasty quickly dwindled to over 3 million square kilometers.

Northern Song Dynasty (960-1127), Northern Song dynasty did not completely unify mainland. The sixteen prefectures of Yanyun, Xixia and Dali were separate states, so area was only 2.8 million square kilometers. However, area of ​​the Liao kingdom in north exceeded 4 million square kilometers.

During Yuan Dynasty (1271–1368), Mongol Yuan destroyed Xixia, Siliao, Jin, Tubo, Dali, and Southern Song and unified East Asian continent. By 1279, its territory stretched from Lake Baikal in north to Khami in west, covering an area exceeding 14 million square kilometers. Tang Qixian's map of Yuan Dynasty was not limited and extended to Arctic Ocean, which is very absurd, so it is not accepted.

Ming Dynasty (1368-1644), Ming dynasty unified mainland in 1381 with an area of ​​4 million square kilometers. During Yongle period, Nuer Gandu division was established and Annan conquered, and area exceeded 6 million square kilometers. This data is only kept for 20 years. Subsequently, Ming Dynasty was comprehensively reduced, and area remained within 4 million square kilometers for a long time.

The Qing Dynasty (1636-1912), after founding of Qing Dynasty, annexed Monan Mongolia, old seat of Ming Dynasty, Khalkha Mongolia, various Tubo tribes and various tribes of western regions, with an area of ​​more than 13 million square kilometers. This data was stored for 100 years, and for 50 years after 1858 it was stored on about 11.5 million square kilometers. In 1912, sovereignty over Land of Five Clans passed to Republic of China.