Abstract: Antenna distribution and EMC are key problems about design of the airborne system. By emulatingthe airborne antennas located in the whole plane, the patterns affected by the plane can be gained, and reference toantenna distribution for airborne system can be offered. By analyzing the EMC by use of the method based on theprinciple of the three elements in EMC, the EMC after antenna distribution can be obtained, which can providethe reference to EMC design for the airborne system and avoid the damage