南水北调工程是在长江流域综合利用水资源的基础工程 ,规划从长江上游 (西线 )、中游 (中线 )、下游 (东线 )三条线向北方缺水地区引水 ,是优化资源配置、合理利用水资源、改善水环境、促进国民经济和社会发展的重大工程。介绍了南水北调中线工程的整体布置和金属结构工程量 ,提出了中线工程金属结构防腐蚀措施的基本要求 The South-to-North Water Diversion Project is the basic project for comprehensive utilization of water resources in the Yangtze River Basin. It is planned to divert water from the three lines of the upper reaches of the Yangtze River (west line), the middle (middle) and the lower (east) to the northern water-deficit areas. Resources, improve the water environment, promote national economic and social development of major projects. The overall layout of the midline of South-to-North Water Diversion Project and the amount of metal structures are introduced, and the basic requirements for anticorrosion measures of metal structures in the midline project are put forward