【正文】 ort of homesick on the ocean due to long time sea trip.” Some researchers argued that what the local people told to Ying Gan’s diplomatic corps so difficult to cross the sea was in order to control the silk middle trade with Rome. Ying Gan considered the time and the risk, and finally gave up the plan of visiting to Rome. He returned Luoyang. As a result, it delayed the setup of silk trade connection between China and Rome for seventy years in totality. Profits After longdistance transportation and passing several traders, Chinese silk was as expensive as gold. It was said that one Pi of Chinese silk worthed 12 liang (ancient Chinese moary unit, 16 liang amount half a kilo)gold. According to the estimation of Pliny in his Natural History, Rome lost at least 100 million golden coins to India, China, and Arabian Peninsula annully due to trade. According to Rome history documents, the import of silk valued 100 million Rome golden coins. In Han Dynasty, the Emperor Wu encouraged the trade and made policies, importing at high prices and exporting at low prices, using high profits to stimulate traders of Western Regions, Central Asia, and West Asia to participate into SinoWestern trade. The gold of Rome did not e to China pletely. The trader from Anxi and Rome earned lots. In Rome, local traders earned ten times of profits by trading with Anxi and with India over the ocean. Rich profits, like a mag, acctracted merchants from Central Asia and Western Asia. They were in the middle of envoys came to the Central Plains. As the vice envoy of Qian Zhang returned from Western Regions, many merchants from different regions followed, in the name of contribution, engaging in silk trade. “The merchants traded silk in the name of contribution.” After Chao Ban in Eastern Han Dynasty visited Western Regions, merchants from more than fifty countries joined the silk trade. They came and went, day and night. According to the Series of Western Region’s Exploration of Aurel Stein, archaeologists found bamboo slips in foreign languages (Sughda, Kharosthi, Sanskrit), decorative fabrics, and slippers in western carpet patterns from archaeological sites in Xinjiang and Gansu. Obviously, along the way from Central Plains to Western Regions, there were many things of Central Asian merchants traveler left behind. The exchange of fabrics and techniques In addition to earning gold, the merchants in Han Dynasty exchanged all kinds of wool products with silk. In a letter to Chao Ban from his brother Gu Ban, “We planed to use three hundred Pi white silk to trade with Western Regions.” An ancient poem named “Travel in Longxi” said: “Invitated guests into the north room, and asked them sat on a carpet”. Longxi located in Northwest of Central Plains, the poem told that people used carpets which probably were exchanged from Western Regions. Aurel Stein exmined the fragments of delicate carpets unearthed from Han tomb in Tarim Basin and concluded that the style indicated Rome character undoubtedly. Whether they were produced locally or imported from Central Asia, it proved the power of culture. Thus, it proved that not only wool products were from ancient Greece and Rome, but also people in Tarim Basin absorbed the weaving techniques and patterns in their production of wool products. 4. Conclusion Firstly, about the time of the silk trade existence, as the consensus of scholars, the SinoWestern silk trade existed before the Qian Zhang’s mission to Western Regions, after the two his missions, the Silk Road was more smooth and prosperous. From the Han Dynasty to Tang Dynasty, the SinoWestern silk trade mainly depended on the land transportation before 11 Century. Secondly, At ancient time, Western Regions, as the necessary channel for land transportation of silk trade, was always grabbed by strong nomadic tribes in the north or Dynasties in Central Plains. During Han Dynasty, it was a petition between the Hun and the Han for occupy the Silk road. Thirdly, The SinoWestern silk trade was not run by onestop type. It depended on many middlemen and its relaystations. The SinoWestern silk trade in the Silk Road was not a oneway output of silk from China, but a mutual exchange of diverse modities. Finally, the connection betweem SinoWestern of silk trade made a relationship betweem them, that exchange material cultures, silk, wool woven , and even plants. With the productions’s advent, technics had been transmitted in the new areas. The silke had played an important role in the development of human society. The long term of silk trade relationship had pushed some societies changed, Romans consumed silk but gold drained, Parthian got money, Chinese silk got promotion, etc. It is easier to transmit technics than to make relation between people, or two ethnic groups, or two countries. Human relations had showed a significant meaning in human history already. Through out the silk trade of Han dynasty, human relations in society made the long distance silk trade to be possible. Different people have being created different cultures. But interculture exchange needs social relations. The Sociality is always the nature of human being, the culture is a sort of intermediary for making people to know how to get along together.