OFDM　modulation　is　used　in　the　digital　TV　transmitter.　this　signal　has　some　characteristics　such　as　wide　bandwidth,　multi-carrier,　high　PAPR,　etc.　The　efficiency　of　transmitter　power　amplifier　will　be　made　in　very　high　demand.　In　this　paper　people　will　pull　Doherty　amplifier　in　the　front-end　power　amplifier.　Introduced　the　principle　and　basic　structure　of　Doherty　amplifier.　Through　computer　simulation　people　can　verify　the　performance　of　this　amplifier　circuit　in　the　digital　television　transmission　system.　Also　we　design　the　actual　circuit　and　test　and　achieve　real　results.　Through　the　results,　we　can　find　that　the　Doherty　amplifier　has　soluted　of　the　low　efficiency　problem　in　digital　TV　front-end　transmitter.　So　it　has　great　relevance.　©　2012　Springer-Verlag.