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UWB channel model is the research foundation of indoor positioning in wireless communication system. According to the path loss and multipath fading in channel model, we demonstrate the modeling method and characteristics of path loss channel model, Δ-K channel model and S-V channel model. An improved S-V channel model of UWB system is proposed based on the analysis of the physical channel measured data. Simulation results show the model can better reflect the characteristic parameters of UWB channel.