Abstract: This paper introduces secure data aggregation in wireless sensor networks. In order to solve the problems of security, large overhead and low aggregation precision in current data aggregation schemes, this paper proposes a reference-based recoverable concealed data aggregation algorithm(R-RCDA). The algorithm provides end-to-end confidentiality and integrity authentication for the transmitted data by employing the public-key based privacy homomorphic encryption scheme. Besides, the algorithm sets a new reference for every sensor node dynamically, and the reference will be used in the next round of transmission. It can reduce the amount of transmission by transmitting the difference between the reference and the row sensed data. The experimental result shows that R-RCDA can reduce the amount of data transmission effectively and then improve the energy and bandwidth efficiency of the whole network.