In ancient agricultural societies, there was no substance comparable to food, and if money was an intangible substance used to exchange various tangible substances, then food was an important of all tangible substances.

Qin Shi Huang swept away the six and eight directions, ended the situation of disputes between princes since the Spring and Autumn and the Warring States, ruled the world and established the Qin Empire, and at the beginning of the establishment of the country, it was necessary to restore production, develop the economy, and consolidate political power. Therefore, if the land is not cultivated and grain cannot be produced, the political power will naturally not be stable, and only when the land is vast can we stabilize the people's hearts and maintain the continuation of the political power.

The first article of the "Pipe" book, "Herdsmen", begins: "Whoever has a land herdsman shall guard the barn at four o'clock, and those who have many fortunes and fortunes will come, and those who have great fortune in the land will leave the people in the place." Here it is pointed out that the fact that all the land is cultivated is a condition for the people to live for a long time without moving. Land reclamation is an important link in the development of agricultural production and is fundamental. Grain grows from the land, and without extensive cultivation of the land, there will be no sufficient food for the "command of the people."

As a agricultural tool of the Qin Dynasty, bronze gong is mainly used to reclaim land, cut wood, the body is single or double slope, the shape and handling method is the same as the cymbal, its production and use can be traced back to the Xia Shang and Zhou Dynasty, to the Qin Dynasty when the number increased, mainly concentrated in the Central Plains of China (Henan Luoyang, Shaanxi and other places). Bronze gong is often called jin in ancient times, used for land reclamation, the shape is developed from the Neolithic stone gong, single-sided blade, not only used in agriculture, but also the main tool for leveling the soil, and later used in woodworking, there was no planer in ancient times, to make the wood flat is not with planing, but with gong, many have been passed down to later generations.

The picture above is a bronze gong of the Qin Dynasty, 10 cm long, 4.5 cm wide, 2.5 cm thickest at its thickest point, with a double beveled surface, curved blade, hollow inside, a perforation in the middle and upper part and a handle on the hole, and a convex string pattern on the upper part of the front and back. The bronze is hard , with pale green and peacock patina on the front and mottled black on the back and sides. There are signs of use on the blade. Through this bronze gong, we can get a glimpse of the agricultural production of the Qin Dynasty.