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Privacy preserving in location-based service (LBS) has been an important issue in Vehicular Ad hoc Network (VANET). Traditional k-anonymity algorithm dealing with location privacy protecting problem does not consider vehicle's mobility and inner collaborator. In this paper, we propose a new algorithm which uses dynamic and mobile aware anonymous peer selecting algorithm to improve the anonymity and connectivity in a mobile environment. We also give out detailed analysis and show experimentally that better privacy and connectivity can be achieved with this method.