luxury goods
The way of communication between China and foreign countries in the Tang Dynasty decided what it would buy from abroad. We know that China has a vast territory and there are many ways to communicate with foreign countries. For example, in the southeast of China, the countries that trade with China now are Thailand, Myanmar, Laos and other Southeast Asian countries. As we all know, spices, jewelry, rhinoceros horn and ivory in these countries were scarce luxury goods at that time. So people in the Tang Dynasty will buy these.
Erzhanma
In ancient times, the area west of Hexi Corridor in China did not belong to the Central Plains, and it was also called a foreign country. This is naturally one of the routes of communication between China and foreign countries in ancient times, also known as the Silk Road. I think everyone has heard the name of this road. Then through this road, China exports silk, porcelain and tea, and buys good horses and war horses. As we all know, it is difficult to breed excellent horses in the Central Plains. However, in ancient times, due to terrain, climate, grassland and other problems, the western regions were able to raise very good horses.
manufacturing technique
Every region and country has some technologies handed down. Although the Tang Dynasty was a powerful country at that time, some technologies were not available. It is recorded in the Book of the New Tang Dynasty that Emperor Taizong sent envoys to the Western Regions to inspect the sugar-making methods. Later, according to the principle of sugar making in the western regions, the original sugar making method in China was improved to make the improved sugar taste better than the original. Therefore, the Tang dynasty will also buy production technology from abroad.