First of all, after the collapse of Guishuang Empire, Sasan almost propped up the trade on the Silk Road by himself, completely monopolizing the export channels of China silk and Roman Empire. To this end, Rome and Sasha fought. Sasan and the Eastern Roman Empire signed many trade agreements on China silk, and also established trade cities in the border areas of the two countries and raised tariffs. Merchant ships and caravans passing through Persia have to pay high taxes to Persia to transport silk and other goods across the border. In 533 AD, Justinian the Great of the Roman Empire paid 1. 1 10,000 pounds of Roman gold coins to Sasan, with the intention of enabling Sasan to start this commercial road.

Secondly, in the late 6th century, Yemen's post-Himuye kingdom was threatened by the opposite kingdom of aksum and turned to Sasan and Khosrau I Anushirvan for help. In the name of "diligent king", he took control of Yemen and the Gulf of Aden in one fell swoop, thus cutting off the Silk Road of Byzantine maritime transportation. In this way, Sasha is really aggressive and unkind to Rome, but on the other hand, he has an excellent attitude towards China. With the precedent of establishing diplomatic relations when his predecessor rested, Sassanbos did not forget to have a good relationship with China. They kept paying tribute to China, and the rare birds, animals and treasures were continuously presented to Emperor China in order to benefit from the Silk Road trade.

Thirdly, from the 5th century to the 6th century, Sasha sent envoys to China for friendly visits. Emperor Xianwen of the Northern Wei Dynasty also sent envoys to visit Persia and brought back elephants and treasures presented by the Persian king. During the Sui and Tang Dynasties, there were more frequent exchanges between China and the West. During the reign of Yang Di, China established official trade relations with Persia, and the Persian emperor Khosrau II also paid tribute to treasures in China.

Then, because of the open and inclusive folk customs, the Tang Dynasty attracted countless Hu merchants, rare things in the western regions, and dazzling things in the market. Sassanian dynasty absorbed the wisdom of the previous dynasty and accumulated experience continuously. This is extremely wise in foreign relations, especially in China. Before the country perished, he did not forget to present treasures to the Tang Dynasty, which won the favor of the Chinese dynasty. Therefore, China later accepted the fugitive monarch-Britain's Ruth III Sassanian. Lu Si III came to Chang 'an, was sealed by Tang Gaozong, and settled here.