The economic development in Mainland China is obvious to all. After adopting the open door policy, the differences of competitive advantages among regions gradually contribute to an unbalanced economic development. The huge difference will cause not only economic crisis but also political crisis resulting from people's dissatisfaction on the decline of living standard. This has been gradually erodes the fruits of opening policy and causes a bottleneck on the way forward economic development in the future. The aim of this thesis is to discuss about the unbalanced phenomenon of economical development resulted from the competitive superiority in regions. We thus objectively evaluate the degree of advantages in each region on the aspects of exterior environment, such as plentiful resources in each region, and the demand structure of market, the mutual influence of the geographical distribution of industries and the governmental economical development policies, and the competitive ability of enterprises. In this article, we also want to reach the following goals. First of all, we try to realize what reasons caused the gaps of economical development among regions, what situations it current presented, and what problems it existed. Secondly, looking for the most suitable way of economic development in each region, it would suggest how to upgrade the competitive advantage in those disadvantaged regions. Finally, introducing the environmental competition of each region in the Mainland China to investors, it will let those investors choose the best location for business to promote their market competitiveness in the future.