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Physical evidence is the most immediate and effective tool for public security bureau to analyze and solve a case. In this paper, the Internet of Things intelligent perception technology was applied to physical evidence management, based on the sufficient research on the problems of physical evidence management. And combined the character of the business of public security, a physical evidence management system based on the Internet of Things intelligent perception technology has been formed. The principle and structure of the system are reported in this paper, and the subsystems are also introduced.