In　order　to　overcome　the　shortcomings　of　voltage　source　inverter　for　permanent　magnet　synchronous　motor　in　electric　vehicle,　vector　control　strategy　of　bidirectional　Z　source　inverter　based　on　maximum　gain　SVPWM　is　studied,　and　a　novel　SVPWM　control　method　is　proposed　that　DC　bus　voltage　changes　related　to　PMSM　speed.　By　taking　advantage　of　the　boost　and　buck　characteristics　of　Z　source　inverter,　PMSM　can　run　above　rated　speed　only　by　increasing　DC　bus　voltage　without　flux-weakening.　Simulation　results　prove　the　effectiveness　of　the　proposed　method.