In order to analyze the mechanism of airport network delay propagation from a macro perspective. a delay propagation model was established based on the complex network SIS infectious disease model. Starting from the similarity between the time-varying airport network delay propagation and the SIS infectious disease model, the airports are built as nodes to establish a network. Defines the different states of airport nodes in the process of airport network delay propagation. Establishing airport network delay propagation dynamics model based on the transition mechanism between node states. And plan flight flow path based on flight schedule. Taking 153 airports nationwide as an example, collecting flight delay data, performing model simulation and analyzing experimental parameters. The results show that the delay of the delay of the airport network is limited. The network will inhibit the propagation of delays and will not cause the collapse of the entire network. The model is effective and practical, and can simulate the actual delay of the propagation process.