Just like the name of the Silk Road, on this long road of more than 7,000 kilometers, silk, like porcelain of the same origin in China, became a symbol of prosperity and civilization in East Asia at that time. Silk is not only an important luxury consumer goods on the Silk Road, but also an effective political tool for China dynasties. China's diplomatic envoys to the western regions and even further countries often regard silk as an effective means to express the friendship between the two countries. Moreover, the spread of silk to the west has slightly changed the impression of China in western countries. As the high prices of silk and porcelain spread to Constantinople, quite a few people think that China and even East Asia are rich areas with rich products. Heads of state and nobles used to wear China silk dyed with Phoenician red and use porcelain as a symbol of glory at home. In addition, lapis lazuli from Afghanistan also flows into Europe and Asia with the caravan. The widespread spread of this kind of trade commodity far before silk in Eurasia has contributed to the promotion of trade exchanges between Europe and Asia. This precious commodity was once a symbol of national wealth in the two river basins. After lapis lazuli was spread to India, it was regarded as one of the seven treasures of Buddhism by Buddhists there, adding a long religious color to lapis lazuli. The spread of grapes, walnuts, carrots, peppers, beans, spinach (also known as Persian food), cucumbers (called cucurbitaceae plants in Chinese) and pomegranates has added more choices to the daily diet of East Asians. After historical development, the wines from the western regions have been integrated into the traditional wine culture in China. Caravans mainly transport iron, gold, silver, mirrors and other luxuries from China. What is shipped to China are rare animals and birds, plants, furs, medicinal materials, spices and jewels.