500 kV海南联网工程后续抛石保护工程具有施工难度大、施工设备自动化程度高、涉及技术领域广泛的特点。介绍了该工程建设前期进行的海底电缆现状调查、设计论证、试验研究，以及施工中石料的制备、工程控制等工作。工程中采用的落石管技术、水下机器人检测装置均代表了世界海洋工程技术发展水平，对国内海洋工程技术发展与工程测量装备研发具有参考意义。

The follow-up engineering construction of riprap protection for 500 kV Hainan interconnector project has some characteristics, such as great difficulty in construction, high degree automation in construction equipment, widely involving in technology field. This paper introduced the present situation investigation, the design argument, the experimental research of submarine cable in the early period of the project, as well as the preparation of rock material and the control management in the construction process of the project. The rockfall pipe technology and remote operated vehicles adopted in the project both represent the advanced development level of ocean engineering technology in the world, which has the reference significance to the development of ocean engineering technology and the research of engineering measurement equipment in China.