Abstract: Offshore wind energy in deep-sea areas is one of the main clean energy sources for the development of international society at present. However, under adverse weather conditions such as typhoons, floating wind turbine structures are highly prone to safety accidents. This paper mainly studies the mooring characteristics of Spar-type floating wind turbines under severe sea conditions. First, the geometric model of the wind turbine is established using GeniE, and meshing is performed. Based on the potential flow theory, frequency-domain and time-domain analyses are conducted for the Spar-type wind turbine. The OrcaFlex software is used to establish a coupled analysis model for the floating body and mooring system, obtaining the time-history curves of the floating body and mooring lines under different working conditions. The results show that the Spar-type floating wind turbine exhibits good dynamic characteristics under severe sea conditions.