The research conducted on honorific and modest words is based on Chinese ancient books, records and handed-down documents. However, there is no consensus on research results due to various research materials used by scholars. This research employs Loulan Documents excavated during Wei-Jin period as research objects, and investigates the usage of honorific words and expressions and the phraseology of modest expressions. A quantity analysis based on thorough studies of most of the modest and honorific expressions in those documents was conducted. And, as a significant consequence, it is discovered that there is a slight usage difference between the honorific expressions in excavated documents during Wei-Jin period and in handed-down documents, which can be explained in three aspects. First of all, the second personal pronouns ‘er’ and ’ru’ are not unseemly words, and ‘er’, ‘ru’ and ‘jun’ are most widely used. Secondly, although part of the frequently used honorific expressions in later ages are used to express modest and respect in Wei-Jin period, they are not grammaticalized and cannot be considered as actual honorific expressions. Thirdly, during Wei-Jin period, not only there are honorific words and expressions, there are also fixed formats of expressing modesty.