I read an interesting article
"Romans in China. This idea was first proposed by Homer Hasenphlug Dubs, an Oxford University professor of Chinese history, who speculated in 1955 that some of the 10,000 Roman prisoners taken by the Parthians after the battle of Carrhae in southeastern Turkey in 53 B.C. made their way east to Uzbekistan to enlist with Huns against the Han Chinese amry who were battling the region at the time. Chinese accounts of the battle, in which Jzh Jzh (a branch of Huns) was decapitated and his army defeated, note unusual military formations and the use of wooden fortifications foreign to the nomadic Huns. Dubs postulated that after the battle the Chinese employed the captured Roman mercenaries as border guards, settling them in Liqian, a short form of Alexandria used by the Chinese to denote Rome. While some Chinese scholars have been critical of Dubs' hypothesis, others went so far as to identify Lou Zhuangzi as the probable location of Liqian in the late 1980s."
I also read an article published in Chinese anthropology journals indicates the discovery of the the Lou Zuangzi Village in Gang Su province northwest West China, describing local residents with European features and ruin sites similar Roman town formations. Chinese historical records suggest the capture of 2,000 European army during the battle during which a lost Roman divison (most likely after The Roman commander Crathiest was killed in battle with the Parthians, his lost legion flew to central asia and was later hired by Huns who were in war with the Chinese in central Asia around 50 B.C.--10 AD) The captured "soliders" were given permission to take residency in current day Gang Su Province China, at the time a outpost of Han Chinese Empire on its trade zone to Persia and Rome known as the "Silk Road".
