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Based on the fixed fairness algorithms, this paper considering the maximization of throughout in networks. Transforming the problem of allocation of bandwidth in centralized scheduling into a question of optimization of fairly allocate the rate, and then simplify it into linear programming problem. So an uplink fair alogrithms based on centralized scheduling is proposed. We use NS2 as the simulation platform simulate and modeling the alogrithms. And the result shows that the new alogrithms reaches the new fairness goal and maximize the utilization ratio of system.