Stability and safety of floating wind turbine platforms in deep and distant sea environments are the core issues of floating offshore wind turbine systems. This paper analyzed the effects of multiple load control parameters on the design wave parameters under extreme wave loads by numerical simulation based on two design wave methods of long and short-term, and evaluated the structural strength of the floating offshore wind turbine platform using different design wave methods. The results show that: the traditional load control parameters of mid-longitudinal profile, mid-transverse profile and waterline plane cannot accurately capture the most dangerous loading conditions suffered by the floating offshore wind turbine platform, and the structural strength analysis of the floating offshore wind turbine platform also needs to take into account the stress concentration phenomenon at different structural connection locations, and thus needs to consider the influence of more load control parameters on the structural strength; the long term statistical design wave method can reflect the complexity of the marine environment more comprehensively, and can obtain the structural strength of the floating offshore wind turbine platform using different design wave methods. The long-term statistical design wave method can more comprehensively reflect the complexity of the marine environment and obtain the design wave parameters of the floating offshore wind turbine platform in the most dangerous state, while the short-term design wave method has the advantage of quickly assessing the structural strength of extreme wave conditions. The two can be used in conjunction with each other in accordance with the different design stages of the floating offshore wind turbine platform. The search for the most dangerous working conditions through the design wave method can not be compared with only the height of the wave parameters in the design.Calculation results show that the maximum stress obtained from two different design wave methods does not necessarily correspond to the highest wave height. This indicates that the wave height alone cannot determine the most critical condition. A comprehensive analysis of factors such as wave height, wave period, wave direction, and phase is required to assess their impact on structural strength. These findings are of significant importance for the structural design and safety evaluation of floating wind turbine platforms.