For the characteristics of limited nodes energy in wireless sensor networks, how to improve the rate of energy utilization and lengthen the lifetime of WSN is a problem that every WSN researchers need to face. It is also the puzzle which should be solved in the WSN development process. Therefore, this paper introduced the Data Integration algorithm into Wireless Sensor Networks. By removing redundant information in sensor nodes the data flow of network is reduced, thus the energy consumption of the network is reduced, and the goals of improving energy utilization rate and lengthening lifetime of network achieve at the same time. In this paper the research foundation was the tree structure WSN. The paper analysis and research the energy consumption of network before and after Data Integration, and give the corresponding energy consumption mode. Followed by the ways of computer simulation and experimental data monitoring, the paper prove the Data Integration is effective in reducing energy consumption of network, and have certain practical value.