Abstract: Optimizing the layout of major regional strategies is an important issue to grasp the new development stage, to implement the new development concept, to construct the new development pattern and to promote high-quality development. The major regional strategies have the typical characteristics of getting rid of the shackles of administrative divisions, strengthening the leading and radiating effect, having specific themes, making top-level strategic planning and setting up the central coordination mechanism. Compared with these typically major regional strategies, Chengdu-Chongqing economic circle lacks the functional characteristics and necessary conditions of the major strategy. If Chengdu-Chongqing region can play well the role of major regional strategy, integrated green strategy of Chengdu-Kunming-Chongqing region will be planned and constructed by relying on Chengdu-Chongqing economic circle, as well as taking trans-regional integration as the breakthrough point and taking green development as the core theme. This development strategy is based on the theory of watershed division and sustainable development, and fully follows the spatial development pattern of the upper Reaches of the Yangtze River on the premise of 'development at the point and protection at the surface’. It also accords with the historical development trend of Chengdu-Chongqing cross-regional cooperation. At the same time, this development strategy has urgent realistic demand and realistic possible conditions, in terms of the promoting innovative development of watershed based ecological civilization construction, establishing strategic links of domestic and international double circulation, ensuring national energy security to achieve 'double carbon’ target, fostering a strong sense of community among the Chinese nation and building the platform to contact South Asia and Southeast Asia. To realize this development strategy, it is necessary to improve the functional positioning of Kunming, to take Guizhou province as the hinterland of green development, to optimize the new development space for living, industry and city, to establish the internal and external transportation network system, to promote the integration of basic public services and to carry out the integration of ecological environment protection.

Key words: Chengdu-Kunming-Chongqing area, integration, green development, major regional strategy