中国最重要的五大城市群，定了

Core Viewpoint - The article discusses the recent policy document on promoting high-quality urban development in China, emphasizing the formation of a new urban cluster pattern characterized by "3+2+N" cities, with three world-class urban clusters and two domestic growth poles as the main drivers of urban development [4][19]. Group 1: Urban Clusters Overview - The document identifies three world-class urban clusters: Beijing-Tianjin-Hebei, Yangtze River Delta, and Guangdong-Hong Kong-Macau Greater Bay Area, which are positioned as the main forces in urban development [4][19]. - The Chengdu-Chongqing area and the Central Yangtze region are recognized as important growth poles for high-quality development, enhancing regional coordination in the central and northeastern parts of China [4][19]. - The "14th Five-Year Plan" outlines 19 national urban clusters, forming a spatial pattern of "two horizontal and three vertical" urbanization [6][8]. Group 2: Classification of Urban Clusters - Urban clusters are categorized into three tiers: the first tier includes Beijing-Tianjin-Hebei, Yangtze River Delta, Pearl River Delta, Chengdu-Chongqing, and Central Yangtze, which are in the "optimization and enhancement" category [8][10]. - The second tier consists of Shandong Peninsula, Guangdong-Fujian-Zhejiang, Central Plains, Guanzhong Plain, and Northern Bay urban clusters, which are in the "development and expansion" category [10][11]. - The third tier includes Harbin-Changchun, Liaoning Central South, Central Yunnan, Central Guizhou, and Northern Tianshan urban clusters, which are in the "cultivation and development" category [12][13]. Group 3: Strategic Importance of Urban Clusters - The three world-class urban clusters are crucial for global resource allocation, international competition, and national development, representing over 40% of China's total economic output [23][24]. - The article highlights that only the three world-class urban clusters and the Yangtze and Yellow River strategies are included in China's highest-level regional strategies, underscoring their strategic significance [24]. Group 4: Chengdu-Chongqing and Central Yangtze Regions - Chengdu-Chongqing is referred to as the "fourth pole" and the Central Yangtze as the "fifth pole," with the former being recognized for its transportation and strategic positioning [25][28]. - The Chengdu-Chongqing area has been officially endorsed as a significant growth pole for national high-quality development, marking its elevation from a "Western growth pole" to a "national growth pole" [31][32]. - The Central Yangtze region, while ambitious, remains more conceptual and faces challenges in becoming a fully realized growth pole due to its geographical and economic fragmentation [35][37].