Abstract: Aiming at the proposed wind power generation system with speed regulation differential mechanism（SRDM）,a triaxial dynamic model of the whole transmission system is established based on the‘spring,damping,mass’ system. Accordingly,a simulation model of SRDM-based wind turbine is built and verified through the experimental platform under three different wind speed inputs. In addition,the accurateness of the simulation model as well as the triaxial dynamic modelling approach are also validated. In order to better analyze the dynamic characteristics of differential gear case in SRDM,the authors establish a torsional vibration model of differential gear case by using the lumped-parameter method. Afterwards,the corresponding vibration differential equations are derived in the case of considering multiple external factors of the proposed wind turbine.