KFX Promgram should be development as SIS(Software intensive System) that can automatically manage deta obtained from several sensors. display information appropriate for the situation awareness and mission control and allow the pilot to use the provided information for prompt and suitable operation of different missions at once. One of the most important equipment is Mission Computer. This study suggests MDA(Model Driven Architecture) and UAI (Universal Armaments Interface) with MOSA(Modular Open System Architecture) for design method of Mission Computer in KFX that guarantees effective integration with avionics system(Sensors, Data Link, Smart Weapon etc) and compatible capability during its life cycle.