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Base on the application in underground coal mine emergency rescue equipment, The paper research a wireless transmission system used wire as backbone network. The system use the SDSL telephone twisted pair as the backbone network, Wi-Fi as a wired network expansion. The audio, video temperature and a variety of multimedia information flow of gas parameters in form of IP packet send to the network, which suitable for application in the coal mine emergency rescue. It achieve specific environmental conditions underground coal mine fast network, address the problem of disaster images, voice and multimedia real-time transmission of environmental parameters to the rescue base and the ground command center. It provides a guarantee for rescue work effective. The paper start from the networking strategy, rescue terminals and transfer between wireless and wired describing the system.