Abstract: Bird song is an important way of studying bird behavior in the field. To understand the relationship between songs and tail action of Plain Prinia（Prinia inornata），we studied their territorial songs during August and October in 2007 in Jiangxi Village of Zhaoqing，Guangdong. The results showed: 1) Plain Prinia had six song types，four were frequent, one transitional and one scarce type. 2) The song was simple but its type varied，indicating different types and degrees of danger. 3) The four song types had connections with different behaviors，and each song was accompanied by tail shaking. Therefore，we concluded that the structure of the songs was simple but varied a lot，and tail action had a function in these territorial songs.