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Identity authentication is one of the important methods to solve the security problem of industrial monitoring and controlling system under the mode of the Internet of Things (IOT). Based on regarding the function framework of LED display screen monitoring platform, the general technique scheme of the platform is introduced, the database of the platform is designed and the transmission realization method of important monitoring data and controlling information is provided. Based on the analyzed of mechanism of USB Key identity authentication, this paper is focused on the design of identity authentication module. The testing results show that this platform can satisfy the basic requirements of LED display screen monitoring under the mode of the Internet of Things, and achieve the USB Key identity authentication to its users.