Steering　system　of　heavy　vehicle　facing　intelligent　and　green　development　needs　to　satisfy　the　requirements　of　high　precision　and　energy-efficient　dynamic　steering.　Traditional　steering　systems　use　valved　servo　systems,　which　offer　high　steering　accuracy　but　result　in　significant　energy　dissipation　at　the　valve　ports.　In　contrast,　the　variable　speed　pump　control　system　(VSPCS)　realizes　the　precise　servo　of　steering　system　through　direct　volume　control,　which　basically　eliminates　the　energy　dissipation　at　the　valve　port.　However,　the　VSPCS　lacks　sufficient　system　stiffness　due　to　low　back　pressure,　making　it　difficult　to　achieve　precise　steering.　To　address　these　limitations,　this　paper　proposes　a　back　pressure　controllable　variable　speed　pump　controlled　steering　system　scheme　(BCVSPCSS),　which　combines　the　energy-efficient　flow　supply　of　the　VSPCS　with　a　servo-proportional　valve　is　used　for　back　pressure　control　to,　improving　the　dynamic　performance　of　the　system.　This　integration　allows　for　precise　steering　while　maintaining　energy　efficiency;　The　design　of　a　dual　objective　nonlinear　control　strategy　for　angle　and　back　pressure　is　crucial　to　deal　with　uncertainty　and　nonlinearity　in　the　system.　The　Lyapunov　analysis　shows　that　the　closed-loop　system　has　asymptotic　stability.　In　this　paper,　the　experimental　bench　of　BCVSPCSS　is　built　for　experimental　verification.　The　results　show　that　back　pressure　control　effectively　enhances　the　system＇s　immunity.　Under　the　same　working　conditions,　the　maximum　angle　error　of　the　two　systems　is　roughly　the　same,　both　around　1　degrees,　while　the　energy　consumption　of　BCVSPCSS　is　reduced　by　about　84.6%　compared　to　the　valve　controlled　steering　system.