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According to the shortcomings of the metal detectors’ management and function in the airport of China, using walk-through metal detectors as subjects, which proposes a system of walk-through metal detectors remote monitoring. It improves the Modbus protocol of industrial bus under the practical requirements. The improved protocol is a standard in communication of a PC to machine and the extended nRF905 circuit is made use for wireless communication. The system can decrease wrong data by double CRC verification and compile human-computer interface by Labview language. It will share the interface on Web through the function of Web Server. The application system is stable by laboratory testing. It can meet the design requirement.