为适应我国国民经济的快速发展，中国需要发展高速铁路，以满足日益增长的客运需求。特别是在我国经济最发达的京沪铁路沿线地区，分布着北京、天津、上海三大直辖市和河北、山东、安徽、江苏四省，京沪线连接环渤海经济带和长江三角洲经济带，京沪两特大城市人口均超过了1300 In order to meet the rapid development of our national economy, China needs to develop high-speed railways to meet the ever-increasing demand for passenger transport. Especially in the areas along the Beijing-Shanghai railway with the most economic development in our country, there are three major municipalities directly under the jurisdiction of Beijing, Tianjin and Shanghai and four provinces including Hebei, Shandong, Anhui and Jiangsu. The Beijing-Shanghai line connects the Bohai Economic Belt with the economic belt of the Yangtze River Delta. The population of the two mega-cities in Shanghai surpassed 1,300