According　to　the　shortage　of　the　traditional　offset　line　in　Doherty　power　amplifier,　a　new　offset　line　technique　is　proposed　to　match　carrier　amplifier　with　the　load　and　to　improve　the　performance　of　the　Doherty　amplifier.　By　simulation　of　the　computer　software,　a　higher　efficiency　is　obtained　using　the　new　offset　line　comparing　the　two　kinds　of　offset　lines.　The　new　offset　line　matching　technique　could　be　applied　in　the　system　with　high　linearity　and　low　power　operation.