The relationship between corner equilibrium and ordinary equilibrium is discussed in this article, at the same time, the marginal analysis method of strongly additive utility function is advanced.

Interest balance is the essence of political equilibrium, which does diversify in many aspects, that is, equilibrium of constitutional institution, roles equilibrium, cultural equilibrium and homogenization in the transformation and interaction of political culture.

The thesis also holds that the rising of the three city groups depends on the finance decentralization reform,so from the"rising triangle"to the"harmonious triangle"still breaks through from the finance reform which means to establish regional horizontal financial equilibrium system to achieve equal public service predicated on the improvement of efficiency.