Abstract:

There are numerous tetra-syllabic words in Bai language. The words do not only exhibit the socio-cultural features of Bai people，but also play a non-negligible role in reflecting the ethnic psychological features. The tetra-syllabic words of Bai language，with their special word formation，incorporating abundant ethnic emotional appeal into the morphemes in the process of lexicalization， could reflect the unique psychological features of Bai people in verbal communication.

Key words: the tetra-syllabic words in Bai language, general features, ethnic psychology