Abstract: Political discourse has been studied for a long period under CDA. However, as politicians usually represent multiple social identity, their speeches correspondingly reflect multiple intentions of political persuasion. Therefore, the explanation of political persuasion from the perspective of meta-function should also take the multiplicity into consideration. President Obama’s speech on ending the mission in Iraq is chosen as its corpus and the three-way interaction of multiplicity of identity, political persuasion and meta-functional strategies is explored. It is revealed that meta-functional strategies are both the linguistic reflection of saliency and insaliency of politician’s multiple identity and the bridge of the discursive realization of political persuasion.