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In this paper, a dynamic clustering for saving energy for wireless sensor network suggested. Our goal is to decrease the probability of missing the target and to increase the tracking exactness. First phase is consisting of selecting cluster head and creating clusters. In the next phase, new creating cluster based on moving targets. So that cluster head calculates the current location of target. In other phase, target tracking in environment be done by routing target among nodes. This cases cause saving energy in total network. We implemented our tracking algorithm in ns-2 simulator. Missing rate in our algorithm is 9%.