Introduction

Language is a weapon and a powerful tool in winning public support，especially during the current information revolution period.Rhetoric can be seen as a cultural tradition，the linguistic self-consciousness，the skills and methodologies brought into play in shaping the convictions of particular audiences——it is also a powerful weapon in the struggle of community against community，worldview against worldview.Rhetoric thereby comes to be viewed as the tool of particular interests，and therefore as a linguistic means for improving a politician's life.

Political discourse is a mixed product of personal development and the relevant social environment in which an individual grows.Any individual political discourse is the result of personal development in certain social settings.Personal development is affected by such factors as the impact a cultural environment has upon the process in which the individual develops his/her personality，the individual's educational experiences，parental influence，social circles，political party，economic status etc.Nevertheless，these“traces”can be found in the individual's speech patterns many years later，even when the same individual becomes a dominant public figure who has the obligation of“suppressing”or hiding these“traces”for the sake of the survival of his/her political party.Thus it is still possible for one to find out what constitutes the underlying influences of the speech patterns of such public figures.Discourse analysis has large volumes of records to testify to this.Australian English is no exception in this regard.