The three-dimensional finite element numerical model of wind power generator unit is created by using ANSYS. The elastic-plastic constitutive is introduced and the nonlinear contact is set up between the foundation stub and concrete. The different reinforcement arrangement’s impact on structure is researched, the strength characteristic and law of reinforcement concrete is discussed and a more rational scheme is raised. It’s more rational to consider the contact status and material nonlinearity. The research results offer scientific basis for design and optimization on foundations of wind turbines.