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Attacker will make a fierce attack based on the probability of inquiry, map data, point of interest (POI), and other supplementary information. The existing location privacy protection techniques seldom consider the supplementary information held by attackers and usually only generate single cloaking region according to the protected location point, and the query efficiency is relatively low. In this paper, we improve the existing LBSs system framework, in which we generate double cloaking regions by constraining the supplementary information, and then<jats:italic> k<\/jats:italic>-anonymous task is achieved by the cooperation of the double cloaking regions; specifically speaking,<jats:italic> k<\/jats:italic> dummy points of fixed dummy positions in the double cloaking regions are generated and the LBSs query is then performed. 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