Abstract: This paper also proposes a generic framework for monitoring continuous spatial queries over moving objects. The framework distinguishes itself from existing work by being the first to address the location update issue and to provide a common interface for monitoring mixed types of queries. We propose algorithms for query evaluation/reevaluation and for safe region computation in this framework. In this paper we address two issues first issue We show that existing approaches may fail to provide spatial anonymity for some distributions of user locations and describe a novel technique which solves this problem and second issue We propose Prive, a decentralized architecture for preserving the anonymity of users issuing spatial queries to LBS. Mobile users self organize into an overlay network with good fault tolerance and load balancing properties. The most important concept of PAM, it is used to the frequently encountered type of query in geographic information system is to find the k nearest neighbor objects to given point in space. In a mobile service scenario, users query a server for nearby points of interest but they may not want to disclose their locations to the service.