In 2019 a Scientific Research & Demonstration Platform was deployed near islands and reefs in South China Sea by a joint research group of 7 institutes and universities in China. It is a simplified small model of a two-module semi-submersible-type VLFS. The test on site has continued for more than one and half years since then for long-term observations to validate the developed key technologies for design and behavior predictions of floating structures deployed near islands and reefs. An integrated information system was set up to continuously collect and inspect the data of the encountered waves, structure responses, connector forces, mooring line forces, anti-corrosion status of the platform, the performance efficiencies of a floating breakwater nearby and a wave energy converter attached on the breakwater. In this paper, the status of the on-site measurements and validations of the key technologies are briefly described.