In order to meet the communication needs of cooperative and networked combat, this paper analyzes the system multiple access system of drone swarm based on combing the advantages of helicopter drone swarm combat, proposes a synchronous network access method with carrier detection capability, studies the network architecture, puts forward a list of capabilities for application mode, topology and service type, and then plans the protocol stack of swarm network. Finally, it considers the working frequency band, time division multiple access system, modulation mode and distance transmission characteristics. And it is concluded that when the link level reserve is 6.45 dB, it can ensure the reliable transmission of self-assembled cooperative link of helicopter-borne UAV swarm.