Introduction to commercial activities: The jade articles, jade daggers, jade handle-shaped objects, turquoise decorations, cinnabar, white pottery urchins and other raw materials found in the Erlitou site are not produced in the Central Plains region, and their sources should be tribute from Fang State. , war and commercial trade, etc. In particular, the seashells found in the tombs of the third period of Erlitou were produced thousands of miles away on the seaside. The ancestors of the Xia Dynasty could only obtain them through these channels. From this, it can be concluded that the Xia Dynasty in the Erlitou period had considerable foreign exchanges. Frequently, the Erlitou site was the political, economic, cultural, commercial, and trade center of the country at that time, and it was the first royal capital of China.