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In this paper we give a quantitative calculation of personal information anonymization in the released navigation data based on the information theory.Individual personal information privacy index is defined and calculated based on the Markov chain model.The simulation of special state model shows that the proposed algorithm can be used to evaluate the ambiguity of different individuals from the navigation data.The simulation is based on Markov chain model,while the proposed personal information privacy metric algorithm does not depend on the motion model,one can apply it to other more accurate individual motion models and provide a quantitative basis for the personal information anonymization for the releasing of navigation data.