Introduction  With the rapid development of offshore wind power, it is necessary to develop new foundation structure of offshore wind power to meet the design requirements of deep water and soft soil foundation.

  Method  In this paper, an offshore wind power project design was taken as an example to do research on a new wind turbine foundation structure which was of large-diameter steel cylinder combined with jacket. Using finite element software PLAXIS 3D, overall stability calculations of the structure were carried out by adopting reasonable and feasible constitutive model and simplified form. Interaction between steel cylinder and soil was considered. Internal forces and displacements of wind turbine foundation were analyzed. Besides, solid model was established by using ANSYS and stress of components under extreme load combinations were calculated.

  Result  The results indicate that the internal forces and displacements of the new combined type of wind turbine foundation are controllable. The new structure is applicative to the construction of offshore wind power on soft foundation and deep water area theoretically.

  Conclusion  The research has certain reference significance to the development of the new type of offshore wind power foundation structure in the future.