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Clustering offers a kind of hierarchical organization to provide scalability and basic performance guarantee by partitioning the network into disjoint groups of nodes. In this paper an energy efficient clustering algorithm is proposed under large-scale mobile sensor networks scenario. In the initial cluster formation phase, our proposed scheme features a simple execution process, which has a time and message complexity of O(n), and eliminates the “frozen time” requirement by introducing some GPS-capable mobile nodes. In the following cluster maintenance stage, the maintenance of clusters is asynchronously and event driven so as to thoroughly avoid the “ripple effect”, thus being well suitable for the high mobility environment. Extensive simulations have been conducted and the simulation results reveal that our proposed algorithm successfully achieves its target at incurring much less clustering overheads as well as maintaining much more stable cluster structure, as compared to HCC(High Connectivity Clustering) algorithm.