In response to the Net Zero Carbon Emission Policy, governments are committed to the development of green energy, and offshore wind energy has been developing rapidly in recent years. Among the industry, marine engineering plays an indispensable role in the supply chain. To adopt the appropriate equipment for windfarm construction, design and optimization would be applied in the early stage. While it is still necessary to carry out testing to validate the equipment and ensure the integrity of equipment to prevent possible accidents. Therefore, this paper will introduce how to design, test and validate the equipment in marine engineering to offer an understanding of how marine equipment operates in offshore windfarms.