A　scheme　is　proposed　for　generating　a　three-dimensional　entangled　state　for　two　atoms　trapped　in　a　cavity　by　one　step　via　adiabatic　passage.　In　the　scheme,　the　two　atoms　are　always　in　ground　states　and　the　field　mode　of　the　cavity　excited　is　negligible　under　a　certain　condition.　Therefore,　the　scheme　is　very　robust　against　decoherence.　Furthermore,　it　needs　neither　the　exact　control　of　all　parameters　nor　the　accurate　control　of　the　interaction　time.　It　is　shown　that　qutrit　entanglement　can　be　generated　with　a　high　fidelity.