Abstract: With the rapid development of offshore wind power technology, deep-sea floating wind turbines become an important direction of future energy development. However, the hydrodynamic characteristics of the fan under extreme operating conditions become a key problem in the design and operation of the deep-sea environment. In this paper, the hydrodynamic characteristics of the deep-sea floating fan under extreme conditions are analyzed in detail. Firstly, the characteristics of the deep-sea environment and the extreme challenge of the floating fan are introduced. Second, Monte Carlo method extreme conditions in the deep ocean. Finally, Morrison’s theory is used to study the wave force, response characteristics and load variation of the floating fan under extreme operating conditions.