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As a kind of time-continuous dynamic games, differential games are paid more attention in recent years. In this paper, we utilize differential game methods to allocate appropriate signal to interference plus noise ratio (SINR) to all users in user-centric networks whose aim is to maximize benefits of users. Specifically, a utility function that takes into accounts both throughput efficiencies and network charges of users is proposed. A optimal solution is obtained by means of differential games; moreover, compared with classic SIR-balancing algorithm, simulation results in different scenarios are given.