The　emerging　smart　grid　requires　more　reliable　communication　technology.　This　paper　presents　a　coded　adaptive　BFSK　PLC　solution　for　medium　voltage　powerline　communication　with　low　SNR　and　frequency　selective　attenuation　.the　measure　based　powerline　channel　model　in　CHINA　is　given　first,　then　the　data　transmission　system　is　proposed　for　MV　PLC.　Three　centre　frequencies　is　used　to　optimize　data　transmission,　the　system　changes　centre　frequency　adaptively　according　to　the　SNR　estimation　results.　The　differential　demodulation　receiver　is　analyzed　include　decode　algorithm　and　other　key　algorithms　.Finally,　we　implementss　the　system　on　ADSP-bf533.　The　results　confirmed　that　it　is　a　feasible　system　solution　for　MV　powerlines.