As an important part of Internet of things (IOT), wireless sensor network (WSN) has been widely used in almost every field and data aggregation is an essential process.So how to protect privacy information in the process of data aggregation from disclosing is of great significance to the development and application of the wireless sensors and the Internet of things in the future.In order to achieve a higher level of privacy protection, this paper proposes a new algorithm suitable for wireless sensor network in the process of data aggregation.The algorithm which is of high security, low energy consumption and high accuracy of data aggregation applies a particular slicing method based on SMART (Slice-Mixed AggRegaTion) algorithm and also combines the characteristics of wireless sensor networks.Simulation results demonstrate that the presented algorithm reduces the communication consumption and quantity, improves the precision of data aggregation and the degree of privacy-preserving to some extent.