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Channel allocation scheme on heterogeneous wireless networks is studied. The contributions of our work are threefold. First, by using network queuing theory, traffic overflowing based channel allocation scheme is presented and analyzed for heterogeneous wireless networks in terms of the connection-level QoS. To decrease channel interference, traffic overflowing are restricted within pre-defined channels. Second, to meet the high QoS requirements of some services and increase the utilization of radio resources, certain services can be transformed between real-time services and non-real-time services as necessary. And third, to further improve the system performance, other priority strategies such as pre-emptive priority are introduced. Simulation results demonstrate that our schemes can lower blocking probabilities and improve system performance.