Abstract: This article tries to analyse the expression power of modal particles in Xiangxi folk songs.The article points out that modal particles in Xiangxi folk songs are not merely a symbol of sound,but more important,a symbol of emotion,that different modal particles convey different message of emotion,that modal particles in music may produce colour contrast and enhance the stereoscopic effect of music,and that the concert of modal particles and music rhythm may make a song more vivid and more lifelike.

Key words: xiangxi folk songs, modal particle, expression power