Tokhāristān ( 吐火羅) is the area between present-day northern Afghanistan and the southern part of Tajikistan and Uzbekistan. Because this area was, in the olden times, the Bactria State of the Achaemenid Empire, and later the territory of the Greco-Bactrian Kingdom, the people from this area were called the Bactrians. Bactrians and Sogdians, who lived in the north area of Tokhāristān, were known as people of commerce, and they were assumed to be rivals in the same trade. Studies about Bactrian people who lived in China, however, have been few so far, and many recent reports of epitaphs do not reflect the contents of the historical material of the epitaphs. And thus, in this study, the author expands the basic study of the epitaphs which contain Luo ( 羅), a Bactrian family name. At the moment, there are four epitaphs which can be determined as Bactrian: Luo Zengsheng and his wife Kang ( 羅甑生及妻康氏), Luo Gui ( 羅炅), Luo Hehan ( 羅何含), and Luo Zhoujie ( 羅州玠). Furthermore, from the contents of those Bactrian Luo epitaphs, their activities have become clear, specifically such as having intimate relations with Sogdians.