This paper investigates resource allocation in OFDMA cooperative networks for maximizing the network data rate and providing QoS guarantees of best effort services and real time services. It defines a network utility function of data rate, delay, and packet loss with power constraints, and the relay and subcarrier dedicated to achieve the optimal utility will be selected for cooperation transmission. With the proposed resource allocation scheme for power allocation on user-relay pairs or only the user over each subcarrier, QoS guarantees of different applications will be achieved. The objective of resource allocation is to strike a balance between maximizing the data rate utility and minimizing the delay and packet loss. By using the optimization theory and related methods, this paper solves the utility function and derives the resource allocation result. Simulation results show that the algorithm can converge. And they show the effectiveness of the algorithm by presenting the power allocation result and the throughput performance and delay performance of the proposed scheme.