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In mobile computing the location information of the objects is an important factor in providing customized services to the users. The location-based service (LBS) is one of the technologies providing the services adoptively according to the changed user position. The existing filtering technology employed in the typical pub/sub model has some drawbacks such as useless connection and wasted queue space. In this paper we propose an efficient and dynamic location- based event service solving these problems. It is achieved by employing location monitor which dynamically manages the event channel. Performance evaluation shows that the proposed scheme provides much higher performance than the existing scheme when the number of suppliers is larger than six.