It’s significant to analyze the dynamic reliability of wind turbine in order to assure the safe and stable operation of wind turbine. In this paper, the dynamic reliability of wind turbine is analyzed with the propeller-type generator as example. The stability of blade of wind turbine under wind load is analyzed by calculating the fatigue load on blade. The frequencies of bending free vibration and torsion vibration of tower are summarized. Finally, the type of foundation and its simplified model are instructed and some useful conclusions are given for supplying basic information on dynamic performance of wind turbine.