An　efficient　scheme　is　proposed　for　the　generation　of　atomic　Schrödinger　cat　states　in　an　optical　cavity.　In　the　scheme　N　three-level　atoms　are　loaded　in　the　optical　cavity.　Raman　coupling　of　two　ground　states　is　achieved　via　a　laser　field　and　the　cavity　mode.　The　cavity　mode　is　always　in　the　vacuum　state　and　the　atoms　have　no　probability　of　being　populated　in　the　excited　state.　Thus,　the　scheme　is　insensitive　to　both　the　cavity　decay　and　spontaneous　emission.