Abstract: The flowing of productive elements, the trend of economic globalization and region agglomeration under market system result in the great changes of the conventional correlation of adjacent cities, which is either administrative harmony or pure competition, and is replaced by a new pattern of "integration and co-prosperity". This paper is based on the preceding positive research, exploring the issue of the background and implication of urban integration, and the features of disintegration. It is put forward that institution innovation, mutual complementary of productive elements, enterprises grouping, united market system and the share and co-construction of infrastructure and eco-environment are the driving mechanism and "nodes" of urban integration. Meanwhile, the integration patterns of "growth triangle", "wild goose flying", "plural polarization" and "double cores" are pointed out.This article holds that it is a new feature of regional and urban development in China in recent years that the distances between cities decrease, metropolis emerges and impacts regional economy. Meanwhile, however, over emphasizing on local benefits and thus disregarding or even damaging overall sustainable development, namely the phenomenon of disintegration have become major problems in regional and urban development. Such phenomenons mainly refer to: ① the similiarity of urban economic function, inappropriate labour division and common industrial structure; ② internal market barrier and local protection in urban agglomeration; ③ serious pollution of eco-environment; ④ lacking plannings; ⑤ lacking overall planning in transport network construction; ⑥ small scale and close organization structure of enterprises. On the bases of these, a new-type interrelation pattern — integration is attempted to direct urban development.