OC4 semi-submersible floating wind turbine has high construction cost due to its structural weight and complexity, and WindFloat semi-submersible floating wind turbine is not suitable for deep sea areas. Therefore, this article first combines the structural characteristics of OC4 and WindFloat semi-submersible floating wind turbine foundation, The OC4-WindFloat semi-submersible floating wind turbine foundation is designed for the 200m water depth environment. Then based on the leaf element theory, Morrison equation and potential flow theory,Coupling analysis of natural period and dynamic displacement response of OC4-WindFloat semi-submersible floating wind turbine under combined action of wind and wave by SimA finite element software. The results were compared with those of OC4 semi-submersible floating wind turbine. The results show that, The natural period and dynamic response of OC4-WindFloat semi-submersible floating wind turbine meet the relevant requirements It also has lower construction cost than OC4 and deeper water performance than WindFloat. Therefore, the research results of this paper have certain guiding significance for floating foundation types.