Abstract: As a new kind of offshore wind turbines foundation,the composite bucket foundations（CBF）not only withstands the vertical load V,horizontal load H and bending moment load M generated by its own weight,wind and wave,but also withstands the torque load T brought by the turbine. In this paper,the finite element software Abaqus is used to analyze the torque bearing characteristics of CBF. The results show that the bulkhead of the CBF can improve the torque bearing capacity. The higher is the aspect ratio,the higher is the torque bearing capacity of the CBF. At the same time,combining the failure mode,a simplified formula of torque bearing capacity which agrees well with the finite element result is proposed. Finally,the bearing capacity characteristics of CBF under composite loading are calculated which turns out that there is a coupling effect between H and T,and V increases the bearing capacity of H and T to some extent.