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In this paper we propose a semi-distributed power allocation algorithm(S-DPA) in the downlink of cellular OFDMA-relay network. This algorithm introduces non-cooperative game theory in the second time subslot for relays and TS algorithm in the first time subslot for base stations. TS algorithm can match the data rate of two-hop links for each relay. Simulation results show that compared with equal power allocation algorithm, this algorithm not only improves the average throughput, but also reduces system energy consumption.