Abstract: The regional integration is a key content of the development of urban agglomerations. While the transport network is one of most important driving forces for the integrated development of urban agglomerations. Located at the intersection of “the Belt and Road” and “the Yangtze River Economic Zone”, the Chengdu-Chongqing Urban Agglomeration plays an important role in promoting the economic growth of western China. Based on complex network analysis method, this paper investigates the integrated development process and pattern of Chengdu-Chongqing Urban Agglomeration from perspective of transport supply network and transport demand network, which is represented by passenger flow. Besides, the impacts of transport network construction on the integrated development of urban agglomeration also is discussed. The result shows: (1) Construction of transport infrastructure expands the connect channels between cities significantly, which contribute to formation of a polycentric and equalized structure of transport network. These new transport infrastructure shapes the rudiment of urban corridors and clusters. (2) The transportation demand network measured by passenger flow still presents a dual-cores structure centered on Chengdu and Chongqing, and the polycentric structure in Chengdu-Chongqing Urban Agglomeration has not been formed. The operation of HSR lines have greatly strengthened the passenger flow between cities along the HSR. (3) The improvement of transport infrastructure network has promoted the connections of cities in Chengdu-Chongqing Urban Agglomerations. However, the level of functional integration demonstrated by intercity population mobility and industrial cooperation is still low, which restricts the process of transportation integration in return. In general, it is necessary to explore paths to integrate the transportation system with local social-economic development for Chengdu-Chongqing Urban Agglomeration, such as intercity population mobility, industrial cooperation as well as urban-rural integration between cities in these area. Meanwhile, construction transport infrastructure is an efficient way for optimizing the spatial structure of Chengdu-Chongqing Urban Agglomeration at this stage, for achieving the deep and comprehensive integration of region. Besides, the governments of the main cities should strengthen dialogue and cooperation to avoid unbridled competition between cities in infrastructure construction and industrial development.