Abstract: With high-speed nodes, dynamic topology, insu±cient wireless bandwidth and variable path quality, IP based applications across intra-°ight ad hoc networks in a contested environment are always blocked by the lack of quality assurance. After analyzing the topology model, protocol stack model of intra-flight ad hoc networks, and the quality requirements, challenges as well, this paper proposes a comprehensive model of QoS provision based on service classification and a corresponding routing method within restricted topologies for intra-flight ad hoc networks. The simulation results indicate that compared with OLSR, this method increases the volume of whole concurrent flows in current networks while satisfying the bandwidth and delay required.