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[Introduction] In the offshore wind turbine, as the connection form of the upper wind turbine and the steel pipe pile foundation, the grouted connections are widely used. In recent years, the power of wind turbines has become larger and larger, and higher requirements have been placed on the performance of the grouted connection. [Method] In this paper, the numerical analysis method was used. And the influence of the parameters of the grouted connection on its mechanical properties was analyzed. Based on the thickness of the grout tg, the ratio of height to distance of shear keys h/s and the ratio of length to diameter of the grouted connection L/Dp, the change of the load-displacement curve, the variation of contact pressure distribution and the stress state was analyzed. [Result] The results of numerical analysis show that the changes of the three dimensional parameters tg, h/s and L/Dp of the grouted connections will affect its mechanical properties. [Conclusion] By analyzing the structural parameters of the grouted connections, it is of great significance to ensure its normal operation and guide the design work.