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Wireless sensor networks (WSNs) have captured considerable attention recently due to their enormous potential applications. Energy has become the bottle-neck problem and has constrained WSNs widely applications. Cluster mechanism has been widely pursued by the research community in order to prolong the life of WSNs. In this paper, we propose an energy-balanced mechanism based on pruning mechanism to tackle the ldquohot pointrdquo problem appeared in WSNs. In order to keep energy-balance, we synthetically use nodepsilas location, residual energy and the count as cluster-head to form an evaluation function that is based on the pruning mechanism. Experimentations show that the proposed strategy can keep the energy-balance of whole cluster as well as prolong the lifetime of WSNs.