Abstract: A distributed adaptive bandwidth allocation algorithm based on reserved bandwidth threshold and traffic transmission levels was proposed to deal with the resource allocation of multi-services in heterogeneous wireless networks(HWNs).According to the multi-homing technology of mobile terminal and the distributed resource management model of heterogeneous networks,the studied problem was formulated as a convex optimization problem by building the network utility function of traffic under the transmission quality of service (QoS) requirements and traffic capacity constraints.An optimal bandwidth allocation matrix was obtained by a dynamic optimization iterative algorithm under the adaptive adjustment of reserved bandwidth threshold and traffic transmission levels with the change of the customer traffic access request.Numerical results demonstrate that the proposed algorithm can maximize the network utility function and reduce the new calls blocking probability as well as guaranteeing the lower communication cost and QoS requirements.