There are still uncertainties and challenges by using floating platforms as the main oil exploitation mode due to lake of actual drilling experience in South China Sea. In order to ensure the safety of platform operation, large amounts of prototype data are needed for environment and structure analysis. From 2011 till now, a prototype measurement project is carried out on a semisubmersible platform “NanHaiTiaoZhan” FPS. Large amounts of data have been collected including parameters of ocean environmental loading, motions of floater and underwater responses of mooring and risers.

In this paper, statistical analysis of floater responses together with marine environmental conditions are carried out for deep understanding of the characteristics of semisubmersible floating platform. In order to study the motion behaviors of floater under harsh storm, the data recorded in a typical typhoon “Nock-ten” are chosen to perform the deep analysis. The measured data, wind, wave, current and floater motions, are analyzed in time-domain and frequency-domain separately. The comparison study of theoretical prediction and prototype measurement result in typhoon weather has been carried out. The data recorded by standalone sensors are processed by program MoorForce. The result of frequency-domain analysis of measured mooring force proves that the significant wave frequency dynamic behavior of mooring line during typhoon weather should be considered in design.

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