Abstract:The Chengdu-Chongqing Twin-City Economic Circle is the fourth largest urban agglomeration in China after the Beijing-Tianjin-Hebei region, the Yangtze River Delta and the Greater Bay Area. At present, the siphoning effect between the two megacities is obvious, which exists a dumbbell-shaped development pattern of "big at both ends and small in the middle", and the trend of "collapse" in central regions such as western Chongqing is obvious. Coordinated development starts with transportation. Taking the western Chongqing region as the research object, the current traffic conditions are systematically analyzed and the existing problems in regional traffic are listed. Combined with the functional localization and development objective of the region, the focus is on three aspects of transportation hub, transportation corridors and public transport system. The detailed measures for the integrated development of transportation are proposed to optimize the regional traffic layout of the western Chongqing and promote the coordinated development of the regional economy, which has certain reference value for the integrated construction of transportation in other metropolitan areas.