In　this　paper　the　design　of　a　Doherty　power　amplifier　is　reported.　The　Doherty　power　amplifier　is　designed　for　high　power　applications　for　modern　communication　such　as　digital　television　system.　In　order　to　gain　high　efficiency　and　good　linearity,　the　offset　line　technique　is　utilized.　For　verification,　a　80W　Doherty　power　amplifier　is　implemented　by　the　computer　simulation　and　circuit　experiment.　The　measured　results　show　the　power　added　efficiency　of　35.5%　and　the　Adjacent　Channel　Power　Ratio　(ACPR)　of　-36dBc　at　the　output　power　of　49dBm.　©　2012　IEEE.