Cloud　computing　is　a　model　for　IT　services　based　on　the　Internet　protocols　and　has　been　expanding　rapidly　for　applications　used　by　individuals　and　organizations.　However,　cloud　computing　brings　not　only　convenience　and　efficiency,　but　also　security　issues,　especially　data　security　and　privacy　protection.　In　this　paper,　we　focus　on　the　privacy　protection　in　cloud　computing　environment　and　discuss　some　technology　for　data　privacy　protection　in　cloud　computing.　We　then　describe　a　user-centric　method　for　privacy　protection　that　supports　user　dynamic　control　on　individual　data　and　assures　remote　data　file　ownership　and　retrievability　to　better　protect　the　privacy　of　user　data.