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Different from conventional wireless networks, the resource of sensor nodes in wireless sensor networks is limited. Therefore the costs of the nodes resource should be minimized when constructing a group key agreement protocol in the wireless sensor networks. To achieve the goal, in this paper we propose a novel group key agreement protocol for wireless sensor networks. In this protocol, the elliptic curve cryptosystem is employed on layer-cluster group model to establish group key. So that it can not only meet security demands of wireless sensor networks but also improve executing performance.