对于国际EPC工程项目而言,采购是项目实施期间的一个核心环节,是实现工程设计的意图、顺利实施工程项目的重要保证。伴随着我国企业在国际高端市场中EPC项目执行,变更争议日益增加,许多学者对EPC项目工程变更和设计变更等进行了研究。本文则从EPC总承包商的角度,结合厄瓜多尔Coca Codo Sinclair水电站项目(以下简称CCS水电站项目)中有关机电设备采购的变更 As for the international EPC project, purchasing is a core link during the project implementation, which is the intent of realizing the project design and an important guarantee for the smooth implementation of the project. With the implementation of EPC projects by Chinese enterprises in the international high-end market, controversy has been increasing. Many scholars have made researches on engineering changes and design changes of EPC projects. In this paper, from the EPC general contractor’s perspective, combined with the change of purchase of mechanical and electrical equipment in Coca Codo Sinclair Hydropower Project in Ecuador (hereinafter referred to as CCS Hydropower Project)