The organization design of united enterprise is based on five core dimensions, and they are the united property rights institution, the united organization structure, the united governance mechanism, the united factor endowment and the united competition mechanism. It operates through these platforms including value chain unity, production integration, marketing integration, logistics unity, human resources unity, culture integration and so on. The proposal of organization design of united enterprise breaks through the purely rational and rigid organization design and changes the generating mode of enterprise's competitive advantages and the pattern of market competition. It adapts to the background of economic globalization, informationization, high technology and comprehensive market reform, and can guide the organization to form the new competitive advantages in both independent and united environment.