What were the four major projects in ancient China?

1, The Great Wall is a miracle created by working people in ancient China. Since Qin Shihuang, building the Great Wall has been a big project. According to records, Qin Shihuang used nearly one million laborers to build the Great Wall, accounting for 1/20 of the national population! At that time, there was no machinery, and all labor depended on manpower. The working environment was steep mountains and deep cliffs.

2. Dujiangyan is located in the west of Dujiangyan City, Sichuan Province, on the Minjiang River in the west of Chengdu Plain. Dujiangyan water conservancy project, which was built in 256 BC, is the oldest and only grand water conservancy project in the world. Its characteristic is that no dam is built to divert water. It is a national key cultural relics protection unit. Dujiangyan has beautiful scenery and many cultural relics, including Fulongguan, Erwang Temple, Anlan Suoqiao, Yuleiguan, Lidui Park, Yuleishan Park and Lingyan Temple.

3. Lingqu is also called Gui Xiang Canal and Xing 'an Canal. In xing an, Guangxi Zhuang Autonomous Region.

Lingqu is a national key cultural relics protection unit, located in Xing 'an, 60 kilometers northeast of Guilin. It is the most complete ancient water conservancy project in the world, with the same name as Dujiangyan in Sichuan and Zheng Guoqu in Shaanxi, and is also called "the three major water conservancy projects in Qin". Mr. Guo Moruo called it: "Responding to the North and South of the Great Wall is a wonder of the world."

4. Grand Canal

The world-famous Beijing-Hangzhou Grand Canal is the earliest and longest artificial river in the world.

The Grand Canal starts from Beijing in the north and ends in Hangzhou in the south. It flows through six provinces and cities of Beijing, Hebei, Tian Jian, Shandong, Jiangsu and Zhejiang, and connects five major water systems, namely Haihe River, Yellow River, Huaihe River, Yangtze River and Qiantang River, with a total length of 1.794 km. In the history of the development of the Chinese nation, it has made great contributions to the development of North-South traffic and the communication of economic and cultural ties between North and South.

Extended data

From the Qin and Han Dynasties to the Ming and Qing Dynasties, many passes along the Great Wall became places or centers for ethnic transactions in the two major economic and cultural systems of agriculture and animal husbandry, and some gradually developed into important towns along the Great Wall. The Great Wall not only ensures the normal development of agricultural economy, culture and animal husbandry economy and culture, but also provides a place and convenience for their exchange and complementarity. It also plays an important role in mediating the two economies and making the agriculture and animal husbandry economy develop in the direction of mutual assistance.

Therefore, the Great Wall not only plays the role of isolating the two economies and cultures, but also shoulders the heavy responsibility of closely linking the two economies and cultures.

During the Qin and Han Dynasties, there were nearly ten million soldiers and civilians. While building the Great Wall, Qin Shihuang began to strengthen the development and construction of border areas, which opened the prelude to stationing farmland to defend the border and developing the border areas. Because it took a long time to build the Great Wall in the Han Dynasty, many people put forward suggestions on immigration, which were adopted and implemented by the Han government.

Immigrants and soldiers guarding the Great Wall cultivated wasteland together, which not only accelerated the economic development of the border region, saved a lot of government military expenditure, but also greatly reduced the pain of long-distance transportation and made Chinese culture spread farther and wider.