Based　on　nonlinear　rheological　theory,　the　conventional　viscous　component　was　improved,　and　a　new　nonlinear　viscosity　component　with　a　variable　viscosity　coefficient　was　proposed.　The　viscosity　coefficient　of　the　new　nonlinear　viscosity　component　gradually　increases　with　the　increase　of　time.　Then,　by　using　this　proposed　component　to　replace　the　conventional　viscous　components　in　Burgers　model,　a　nonlinear　viscoelasticity　creep　model,　which　was　named　Nburgers　model,　was　established.　In　a　certain　condition,　the　Nburgers　model　could　degenerate　into　conventional　Burgers　model.　Triaxial　compression　creep　test　on　salt　rock　sample　was　conducted,　and　the　parameters　of　the　NBurgers　model　were　inversed　according　to　the　creep　test　results　and　nonlinear　least　squares　theory.　The　theoretical　creep　curves　were　obtained　by　substituting　the　parameters　into　the　NBurgers　model.　The　comparison　between　theoretical　curves　and　test　curves　indicates　that　theoretical　curves　obtained　from　NBurgers　model　show　good　agreement　with　test　curves,　and　its　error　is　obviously　smaller　than　that　from　conventional　Burgers　model.　So,　the　viscoelasto　creep　property　of　salt　rock　can　be　better　described　by　the　proposed　model.