In　this　paper,　a　saturation　model　of　induction　machine　in　Perms　of,　space,vector　is　presented.　After　the　differences　of　stable　and　transient　inductance　of　saturation　are　discussed,　voltage　equations　by　space　vector　for　the　stator　and　rotor　of　induction　machine　are　derived　which　take　account　of　transient　saturation　of　main　flux　path.　A　torque　expression　by　space　vector　in　the　same　conditions　is　also　discussed.　Finally,　a　complete　model　of　induction　machine　by　space　vector　is　established.　Some　transient　performances　such　as　start-up　of　induction　machine　am　simulated　using　this　new　model.　The　results　of　simulation　show　that　the　model　presented　in　the　paper　is　feasible.