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After Qin Shihuang unified the six countries, the world was divided into thirty-six counties, and Lanzhou belonged to Longxi County.

At the beginning of the Western Han Dynasty, Lanzhou was still under the jurisdiction of Longxi County. In the second year of Emperor founding ceremony of the Han Dynasty (BC 12 1 year), Huo Qubing led an army to explore the Xiongnu in the west and set up a garrison in the west of Lanzhou, paving the way for the Han Dynasty to open up four counties in Hexi. In the first year of Zhao Di (86 BC), Jincheng County was established in Lanzhou today, which was under the jurisdiction of Tianshui County. In six years, Zhao Han returned to Jincheng County. In the second year of Emperor Gaozu's Xuandi, after Zhao Chongguo pacified Xiqiang and stationed troops in Huangzhong, the rule of the Western Han Dynasty in Jincheng County was strengthened, and seven new counties were established successively. [3]

Emperor Guangwu of the Eastern Han Dynasty built Wu for 12 years, and Longxi County was established in Jincheng County. In the fourth year of Han 'an, Xiqiang Uprising, most of Jincheng County was occupied, and the county magistrate moved from Wu Yun to Wu Xiang (now Longxi County, Gansu Province), and moved back to Wu Yun twelve years later. At the end of the Eastern Han Dynasty, a new Jincheng County was established in Xiping County. Since then, Jincheng County has moved from Wuyun to Yuzhong (now the west of Yuzhong County).

After the establishment of the Western Jin Dynasty, it was still located in Jincheng County. At the end of the Western Jin Dynasty, in the first year of Liang Qian's Yong 'an (3 14), Jincheng County was divided into Zhiyang County and Lingju County. Together with the newly established Yongdeng County, Guangwu County was established in three counties near Yaojie Street in Honggu District of Lanzhou City. In the same year, Jincheng county government moved from Yuzhong to Jincheng, and Jincheng county government and county government lived in the same city.

In the third year of Emperor Wendi (583), Jincheng County was changed to Lanzhou and the Governor's Office was established. Lanzhou is named after Gaolan Mountain in the south of the city. In the third year of Emperor Yang Di's great cause, Zicheng County was changed to Jincheng County, Lanzhou was changed to Jincheng County, Jincheng County and Didao County were under the leadership, and Jincheng was governed by the county. In the 13th year of Daye (6 17), Xue Ju, a captain of Jincheng, rose up against Sui Dynasty, calling himself the overlord of the Western Qin Dynasty, with the title of Qin Xing and the capital of Jincheng. Soon moved the capital to Tianshui, which was destroyed by the Tang Dynasty.

After entering the Tang Dynasty, Yu Wude returned to Lanzhou in the second year (6 19). In eight years, the Governor's Office was established. In 656, Tang Gaozong celebrated the first anniversary of the Qing Dynasty, and it was changed into a state. In the first year of Tianbao, Emperor Xuanzong of the Tang Dynasty, it was renamed Jincheng County. In the second year of Gan Yuan, Tang Suzong, Jincheng County was changed to Lanzhou, and the state ruled Wuquan, which governed Wuquan and Guangwu counties. In the first year of Baoying in Tang Daizong, Lanzhou was occupied by Tubo. In the second year of Emperor Xuanzong of the Tang Dynasty, Zhang Yichao, a native of Dunhuang, Shazhou, revolted, recovered eleven counties in Longyou, and Lanzhou returned to the Tang Dynasty. However, at this time, the Tang Dynasty had declined and could not keep up with the West. It was quickly occupied by Tubo.

In northern Song Zhenzong and during the reign of Injong, Dangxiang defeated Tubo ministries many times. In the third year of Song Renzong Jingyou (1036), Tangut Yuan Hao defeated Tubo and occupied Hexi and Lanzhou. In the fourth year of Yuanfeng, Song Shenzong (108 1), the Northern Song Dynasty took advantage of the civil strife in Xixia imperial court to mobilize troops to attack the summer and recover Lanzhou. From then on, Song and Xia faced each other across the river and attacked each other.

In the first year of Shaoxing (1 13 1), Lanzhou was conquered by Jin Jiang after being ruled by Song Ting for half a century. Since then, Lanzhou was recaptured by the Song Dynasty in the first year of Jin Dading (1 16 1), but it was immediately lost. Therefore, after the Southern Song Dynasty, Lanzhou entered a new round of competition between Jin and Xixia. Until Jin Aizong Tianxing three years (1234), Mongolia destroyed gold and occupied Lanzhou.

Su Wangfu, the former seat of Gansu Provincial People's Government.

In the second year of Hongwu in Ming Taizu (1369), the Ming army defeated the Yuan army, captured Lanzhou, and set up Lanzhou Wei the following year. Hongwu five years, Zhuang Langwei; In the first year of Jianwen (1399), Wang Su Zhu Bi led the Ganzhou Guards to move to Lan Fan County (Lanzhou), with three soldiers guarding the city and seven soldiers opening fields. In addition, immigrants from southeast provinces are constantly moving into Lanzhou to reclaim land, build water conservancy projects, promote economic development and increase population. By the time of Chenghua, Lanzhou had "more than 10,000 military houses inside and outside the city".

In the early Qing dynasty, it stood in accordance with the Ming dynasty. Lanzhou belongs to Lintao Prefecture and Wei belongs to Shaanxi Province. In the thirteenth year of Shunzhi, he was laid off and returned to the state. In the second year of Kangxi, Lanzhou Wei was rebuilt.

In the fifth year of Kangxi (1666), Shaanxi and Gansu were separated and Gansu was established as a province. The capital moved from Changgong (now Longxi) to Lanzhou. Since then, Lanzhou has been the political center of Gansu.

After three years of Qianlong (1738), Lintao House was moved from Didao to Lanzhou, renamed Lanzhou House, and changed to Gaolan County. At that time, Lanzhou government was in charge of drip irrigation and Hezhou. Gaolan, Jinxian, Weiyuan and Jingyuan counties.

In the twenty-ninth year of Qianlong, the Shaanxi-Gansu Governor's Office was moved from xi 'an to Lanzhou and reduced to the Governor of Gansu. From then on, Lanzhou became the political and military center of the northwest, which was used to "control the Three Qin Dynasties" and "Huairou the Western Regions".

After the Revolution of 1911, a road was set up in Fuzhou in the second year of the Republic of China. Lanshan and Changgong were Lanshan Road, which governed fifteen counties including Gaolan, Hongshui, Yuzhong, Didao, Daohe, Ding Ning, Tao Sha, Jingyuan, Weiyuan, Dingxi, Lintan, Longxi, Minxian, Huining and Zhang Xi 'an. Daoyin is stationed in Gaolan County, the provincial capital. In the Republic of China 16, it was divided into a district, and Lanshan Road was changed to lanshan district. In 25 years of the Republic of China, Gansu Province was designated as seven administrative supervision departments, and Gaolan and Yuzhong were the first administrative supervision areas, which were stationed in Min County.

In 30 years of the Republic of China, the suburbs of Gaolan County were set aside to establish Lanzhou City, which together with Gaolan County ruled today's Lanzhou Chengguan District. Urban area 16 km2, population172,000. 1933, the urban area expanded to Yangwa Mountain in the east and Tumendun in the west, excluding Matan, Shizuizi, Baliyao and Gaolan Peak in the south and Yanchangbao and Shilidian in the north, with an area of 146 square kilometers.