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The privacy preservation problems in the process of information exchange have been summarized, according to the latest study and review related. Firstly, the different kinds of information service modes in pervasive networks, induce the essence of the information dissemination were introduced, and the risks of privacy information leakage during the information exchange were analyzed. Then the current research status of the information privacy awareness, privacy metric, self-adaptive adjustment scheme, privacy splitting and authorization extension were concluded. Finally, four research directions including the privacy awareness in the multi-source environment, scenario-aware privacy measurement, scenario defined privacy protection scheme, privacy splitting and authorization extension were proposed.