Abstract: The base of wind turbine generator set is an important supporting structure of wind turbine.Take Huitengxile wind power plant as examples, it conducts reinforcement design of wind turbine generator set base through the establishment of the three-dimensional nonlinear finite element model of wind turbine generator set base.In the full consideration of materialnonlinear feature, and on the premise of conducts reinforcement design of wind turbine generator set base, it analyzes the crack distribution and crack width of wind turbine generator base structure.The results show that for the overall reinforcement of wind turbine generator base, when the vertical reinforcement stress value of base steel ring outside become maximal, and if carries on the reasonable design of reinforcement, the crack distribution and crack width of wind turbine generator base can meet the operation requirement.