Abstract: The ways of Design of two King Air 350 National Operational Aircraft in the Project of Weather Modification Capabality Building in Northwest China, differentiation and generalization, are introduced. Meanwhile, the principles, train of thoughts and schemes of modification and integration of the airborne atmospheric observation system, airborne cloud seeding system and air-ground communication system are introduced. Finally, the way of aircraft modification will provide a basic support for the following Regional Weather Modification Project.