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WSN has been widely used in many prospects, and more and more researchers at home and abroad are paying attention to this hot field. However, due to the deployment of environmental requirements and their conditions, most of the mechanisms used in traditional wireless networks are difficult to directly apply to wireless sensor networks. So, it is very eager to design a special wireless sensor network. This paper introduces wireless sensor network routing protocols and describes the security routing of wireless sensor network. Moreover, this paper has done deep research on SPIN. Finally, through the analysis of NS2 simulation, we prove that SPIN protocol is valuable in security performance evaluation and confidentiality.