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This paper studies the resource allocation problem in orthogonal frequency division multiple access (OFDMA) cooperative relaying cellular systems. Most existing work on resource allocation does not fully consider all the influential factors for such systems. In the paper, we formulate the optimization problem for resource allocation, including relay selection, subcarrier assignment, and power allocation under a total power constraints and users' quality of serves (QoS) requirements. Since the optimal solution is complex to obtain, a suboptimal solution by making continuous relaxation and solving the dual problem is proposed. Numerical results show that our proposed algorithm can achieve superior capacity performance and low otage probability due to allocating the subcarriers and the power efficiently.