Abstract: Data aggregation is an important method to reduce energy consumption in wireless sensor networks.Data aggregation for cluster -based wireless sensor networks usually consists of in -cluster aggregation and fusion data transmission,most of existing schemes are mainly focus on the cluster construction or the efficiency of fusion data transmission.Authors proposed an inner -cluster data aggregation scheme for wireless sensor networks,agent nodes are selected with assist of location information and only the nodes have different readings with agent nodes transmit their data to cluster head,thus reduce the inner -cluster transmissions.Analysis and experiments show that our scheme reduces inner -cluster transmissions effectively and lowers the communication overhead.