Wavelength division multiplexing (WDM) optical network is the direction of the airborne network development. The combination of wavelength routing and electric exchange is the main method to complete the airborne WDM optical network interconnection currently. One of the cruxes is how the airborne network node is subnetted. The large traffic distribution of mutual communication between the nodes is assigned to the same subnet, employing the wavelength routing transmission; the low traffic distribution of mutual communication between the nodes is interconnected by electric exchange. Based on clustering algorithm in multidimensional space, the node traffic distribution problem is converted into spatial clustering problem, which completes node location preprocessing and node flux-location clustering to solve the airborne WDM network subnet partition, and it finally verifies the feasibility of the method through examples.