Pelagic clustering islands are rich in renewable energy resources such as wind energy, solar energy, and wave energy, and are surrounded by uninhabited reefs and sandbars where shallow reefs are wide. Coordinating the development of island resources to achieve complementary advantages, it will provide strong support for the development of pelagic clustering islands. This paper focuses on the future development of pelagic clustering islands, and introduces an innovative development model that distinguishes island functional orientation, achieves energy linkage, and multi-island joint development to provide material and energy support for the development. In the model of resource islands supporting the energy demand of load center islands, the capacity configuration of resource islands seawater desalination devices and accumulators that economically dissipate renewable energy is studied, and the optimal capacity is obtained using the optimization algorithm. It can realize a full use of renewable resources in resource islands and mostly meet material and energy requirements of load center islands under the minimum total cost. This work is supported by National Natural Science Foundation of China (No. 51537003).