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In recent years, data aggregation of the wireless sensor networks has become a very important issue in research. In this paper, We propose a Tree-based Data Aggregation Mechanism (TDAM) in wireless sensor networks. Building a tree structure in the initial phase of the network, and use the hybrid parameters to choose the transmission path, and remove the extra part of the data which are aggregated by all the sensor nodes in the network through the data aggregation in each round. Finally, it will achieve the effect that saving power and extending the lifetime of the network.