Based on the philosophy of dialogue and systemic functional linguistics,this article studies multidimensional roles of the speaker in texts and the multidimensional and interactive relationship between these roles.In the two worlds（＂I-Thou＂ and ＂It-It＂ worlds） constructed in texts,the speaker plays three roles： dialogist,participant and background roles.Dialogist and participant roles determine and background roles influence the linguistic features of texts.These three kinds of roles sometimes cooperate and sometimes conflict with each o...
