To　improve　the　steering-rolling　motion　safety　of　vehicle,　a　LQG　controller　for　active　suspension　was　developed.　A　dynamics　model　with　3　degrees　of　freedom　depicting　vehicle　steering-rolling　motion　was　established.　Lateral-load　transfer　ratio(LTR),　rolling　angle　and　its　acceleration　were　chosen　to　construct　the　evaluating　indexes　of　comprehensive　performance　for　vehicle　rolling　motion　safety.　In　order　to　solve　the　problem　that　the　general　design　approachs　couldn＇t　track　the　system　disturbance　term,　namely　the　steered　angle　of　front　axle,　and　the　control　vector　couldn＇t　be　solved　because　the　determinant　of　weighted　control　coefficient　matrix　equaled　to　zero,　the　new　method　was　scheduled　as　follows:　the　steered　angle　of　front　axle　was　introduced　into　a　differential　equation　in　accord　with　the　minimum　phase　system,　the　differential　equation　was　combined　with　the　original　system　equation　into　an　augmented　system　equation,　and　the　infinitely　small　terms　including　control　terms　were　added　to　the　evaluating　indexes　of　comprehensive　performance　to　meet　the　design　condition　of　LQG　controller.　Based　on　the　analytic　hierarchy　process(AHP)　and　normalization　method,　the　statistical　data　of　automotive　steering-rolling　motion　were　obtained　by　simulation　under　fish-hook　working　condition,　and　then　the　weighted　coefficients　of　LQG　controller　were　determined.　The　working　effects　of　LQG　controller　of　active　suspension　for　steering-rolling　motion　safety　of　vehicle　were　verified　by　numerical　simulation　under　multiple　working　conditions.　Simulation　result　shows　that　the　developed　LQG　controller　does　not　interfere　with　the　steering　operation　of　driver.　Compared　with　the　passive　suspension,　when　the　active　suspension　is　regulated　by　the　developed　LQG　controller　under　fish-hook　working　condition,　slalom　working　condition　and　double-lane　change　working　condition,　the　variances　of　LTR,　namely　the　most　important　evaluating　index　of　rolling　motion　safety,　decrease　by　32.08%,　32.82%,　and　29.24%,　respectively,　the　variances　of　rolling　angle　reduce　by　47.74%,　44.19%,　and　63.41%,　respectively,　and　the　variances　of　rolling　angle　acceleration　reduce　by　87.30%,　60.00%,　and　86.39%,　respectively.　So,　adopting　the　active　suspension　with　the　new　developed　LQG　controller　can　significantly　improve　the　rolling　motion　safety　of　vehicle　and　achieve　good　steering　condition　adaptability.　©　2017,　Editorial　Department　of　Journal　of　Traffic　and　Transportation　Engineering.　All　right　reserved.