In　order　to　look　for　the　effective　way　to　enhance　the　mass　transfer,　constant　reflux　ratio　batch　distillation　experiments　in　the　rotating　packed　bed　were　made　using　ethanol-water　binary　system.　The　variation　of　average　mass　fraction　and　recovery　were　investigated　by　altering　rotating　speed　n,　reflux　ratio　R　and　mass　fraction　of　ethanol　wF.　The　results　show　that　the　average　mass　fraction　and　recovery　of　ethanol　increase　with　increasing　n,　and　exist　the　best　rotating　speed　nopt.　The　average　mass　fraction　and　recovery　of　ethanol　increase　slowly　with　increasing　R.　The　average　mass　fraction　increase　with　increasing　wF　and　the　recovey　of　ethanol　increase　first　but　then　decline　increasing　with　wF.　Therefore,　batch　distillation　is　suitable　for　processing　the　high　mass　fraction　feed　in　totating　packed　bed　and　operating　under　small　reflux　ratio　and　low　rotating　speed.