Abstract : This paper mainly discusses the system design method of a wireless sensor network data fusion system. It analyzes several aspects that need to be considered in the system design, including the design and selection of data fusion algorithms, the design and selection of data fusion routes, and the system software architecture design methods and considerations. The issues that should be considered in each aspect are discussed, and a solution and design idea are given, laying the foundation for future engineering development. Keywords : Data fusion; Algorithm; System design 0 Introduction A wireless sensor network data fusion system can effectively fuse data, reduce the transmission of redundant information, and thus greatly reduce network energy consumption and increase network lifetime. At the same time, the wireless sensor network data fusion system provides a visual human-machine interface for data. With the data fusion function, the network measurement data is presented to the observer more accurately, avoiding the observer being overwhelmed by a large amount of data and thus overlooking important points. From the system, the observer can grasp the current status of the network monitoring environment and the possible situations, that is, the changing trends of the measurement data, in a short time. Then, based on the changing trends, the observer can judge whether a danger will occur and take corresponding countermeasures. The data fusion system can dynamically adjust the measurement parameters of nodes in the network and the weights of network routes based on changes in monitored data, achieving interest-driven data fusion and routing. Download the full text of the implementation and algorithm simulation of the wireless sensor network data fusion system.