To　solve　the　problem　of　privacy　preservation　while　accessing　services　in　the　cloud　computing　environment,　a　method　based　on　trust　and　signaling　theory　for　privacy　protection　was　proposed,　In　the　method　cloud　server　was　as　an　active　service　provider,　cloud　user　calculated　the　initial　trust　using　the　quality　of　service.　In　the　game　of　the　cloud　user　privacy　and　access　to　services,　dynamically　adjusted　the　privacy　of　information　and　services　the　supply　relationship　based　on　the　trust,　the　largest　expect　income　and　the　balance　between　privacy　services　were　achieved.　Analysis　shows　that　this　method　constitutes　a　perfect　Bayesian　equilibrium,　which　can　effectively　suppress　the　fraud　service　providers　in　the　cloud　computing　environment　to　achieve　user　privacy　protection　and　achieve　the　balance　of　access　and　services.