In　China,　rockburst　disaster　occurs　mostly　in　construction　of　underground　engineering　in　Qinghai-Tibet　Plateau　and　its　adjacent　region.　Previous　research　on　deep-buried　tunnels　has　indicated　that　tunnels　stability　is　related　to　in　situ　stress　state.　To　quantify　these　relationships,　three-dimensional　finite　element　modeling　was　done　to　analyze　the　influences　that　the　angle　ϕ　between　the　maximum　horizontal　principal　stress　orientation　and　tunnel　axis,　and　the　lateral　pressure　coefficient　KH,　had　on　the　tangential　stress　σθ　in　a　deep-buried-curved　tunnel.　Based　on　the　in　situ　stress　condition　in　Qinghai-Tibet　Plateau　and　its　adjacent　region,　50　different　simulation　conditions　were　used　to　analyze　the　relationship　that　ϕ　and　KH　had　on　σθ　for　the　rock　mass　surrounding　the　tunnel.　With　the　simulation　data　produced,　predictive　equations　were　generated　for　σθ　as　a　function　of　ϕ　and　KH　using　multivariate　regression　analysis.　These　equations　help　estimate　σθ　at　various　key　positons　along　the　tunnel　boundary　at　Qinghai-Tibet　plateau　and　its　adjacent　region.　The　equations　were　then　proved　by　a　set　of　typical　tunnels　to　ensure　validity.　The　results　concluded　that　the　change　in　ϕ　has　a　significant　impact　on　σθ,　and　thus,　the　stability　of　the　tunnel,　when　30°　＜　ϕ　＜　60°,　with　the　most　obvious　influence　being　when　ϕ　is　about　45°.　With　the　equations,　the　rockburst　potential　at　a　certain　location　within　a　curved　tunnel　can　be　quickly　estimated　by　calculating　ϕ　and　KH　on　σθ,　without　need　of　geo-stress　background　knowledge　and　heavy　simulation,　allowing　for　the　practical　value　in　engineering　at　design　phase　for　the　projects　in　Qinghai-Tibet　Plateau　and　its　adjacent　region.　　©　2021　Huiqing　Wang　et　al.