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UTRAN Long Term Evolution is being standardized in 3GPP with the aim of more than twice the capacity over High-Speed Packet Access currently．The Fractional Power Control(FPC)algorithms aim is avoids the inter-cell interference．This paper evaluates the proper value of the most important parameter α in the formula according system—level simulation，and provide a supplement for the PC algorithm that power control should consider the effiective time of TPC．