Abstract: The space-ground integration information networks is a special network system which uses space platform as the carrier to acquire, transmit and process spatial information in real time. Among them, the near-space flight vehicles are characterized by strong-flexibility, large-capacity, low maintenance cost and long hang time. It is an indispensable part of the space-ground integration information networks. However, in the current mainstream network architecture design, the research on the protocol architecture of the near-space flight vehicle is not enough, and the function is not clear. This paper proposes a novel near-space access network based of the space-ground integration information network，which could be temporarily erected in hot regions or emergency situations, as an effective supplement of satellite communication system. Then, the paper studies the hierarchical autonomous region network model and typical application of near-space access network. Finally, according to practical application requirements, this thesis elaborates protocol design of the network layer, the data link layer and the physical layer. The network layer adopts a hierarchical structure which can optimize network resource utilization and improve the dynamic network management capability. The whole network can be set up quickly and flexibly without any fixed infrastructure support. The wireless channel is divided into two parts in the data link layer, which uses SPMA protocol (statistical priority-based multiple access protocol) and DTDMA protocol (dynamic time division multiple access) respectively to guarantee the QOS (Quality of Service) demand of different services. The physical layer of the near-space access network can be designed with multiple boards, each of which supports different waveforms in order to communicate with heterogeneous networks.