Electro-hydraulic　servo　steering　system　(EHSSS)　is　a　key　technology　for　heavy　vehicles.　The　traditional　EHSSS　has　high　control　accuracy　but　low　energy　efficiency.　Therefore,　this　paper　proposes　a　novel　EHSSS　based　on　independent　metering　system,　which　can　combine　high　steering　accuracy　with　high　energy　efficiency.　Firstly,　two　servo-proportional　valves　are　used　to　reduce　the　throttling　loss　at　the　meter-out　orifice.　The　servo　motor　pump　is　used　to　keep　the　pump　supply　pressure　at　a　low　value.　Then,　to　ensure　high　steering　accuracy,　a　position-velocity-pressure　combined　control　strategy　is　proposed　for　easy　engineering　practice.　And　a　smooth　switching　strategy　is　proposed　to　achieve　smooth　mode　switching　at　high　frequency.　Finally,　the　effectiveness　of　the　proposed　method　is　verified　by　experiments.　The　experimental　comparison　results　show　that　the　proposed　method　can　achieve　the　same　accuracy　as　the　valve-controlled　steering　system　with　less　energy,　and　can　realize　smooth　mode　switching.