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This paper studies the resource allocation problem for heterogeneous services in decode-and-forward orthogonal frequency division multiplexing system. A resource allocation algorithm is proposed to maximize the data rate of non-realtime service (NRTS) while satisfying realtime service (RTS) requirements. The problem to be solved is decomposed into two sub-problems: power allocation for RTS and NRTS. The problem of RTS is solved with Lagrangian method. A two-step method is proposed for NRTS. Simulation results show that the proposed algorithm has a much better performance than the fixed algorithm and its complexity is less than the exhaustive algorithm.