Abstract: The maglev flight tunnel is a novel concept aerodynamics test facility, in which the high speed translation of the moving model in the long straight closed tunnel would induce extremely complicated aerodynamic characteristics. The motion of model’s fast acceleration, deceleration and constant speed moving have strong interference to the surrounding fluid field, causing wave propagation problems and the aero-structure single way coupling problems. The unsteady characteristics originated from the high speed moving of the model in the maglev flight tunnel are investigated and evaluated from the view of aero-structure coupling. Based on the new CE/SE method, the 3D surrounding compressible fluid of the moving model in tunnel is solved, and the aerodynamic parameters variations, wave propagation characteristics and the pressure distribution in the tunnel are obtained. Simulation design analysis of parameters for porous medium wave absorbing materials is conducted, which could provide a support for the key technical problems like wave absorbing construction design of the maglev flight tunnel.