the 21st century being called the age of urbanization, during which period towns and cities have experienced an increase of 50% in population. The effects of urbanization are not the same world-wide; rather, they differ regionally. While the situation in the industrialized nations of the world is challenging, it is still under control. However, we have to face the fact that the inferior situation in the megacities of developing nations is escalating and is, in many cases, out of control. Hence, development of the subcenters concept was selected as the solution to Bangkok Metropolis’ problems. Nine subcenters were developed in Bangkok Mega-city. The subcenters within the jurisdiction of Bangkok Mega-city serve the purposes of travel time and metropolitan structure, of improving the quality of life in the mega-city in view of the current state of urban problems, and of discussion of ideal urban infrastructures from the standpoint of realizing the feasibility of the paper proposed for land-use planning policy.