People and industries have concentrated to the big cities to achieve economies of scale. However the problems of this urban concentration become gradually obvious and have limited the development of the metropolises. They are hardly managed by current planning measures. In the diversifying social needs for heterogeneous life styles and sustainable mobility, now it is inevitable to adjust the sustainable space system. As an alternative answerable to this new demand here is suggested an approach of network cities. The conceptual approaches can be applied to other countries, especially functionally centralized nations or developing countries which experience now rapid urbanization than any other times.