According to designed parameters, the rigid model of the large wind generators has been built in UG software, the impeller is selected to be researched object, modal neutral files of key parts are attained by the analysis in ANSYS software. The analysis model of multi-flexible bodies of the impeller is built in ADAMS software. With analyzing, predigesting, loading of wind loads and analyzing of dynamic simulation of impeller model, a lot of dynamic parameters of flexible impeller are obtained, which are truer and exacter. These provide certain basis of the loads for designing, analyzing, optimizing the design of key parts of large wind generators in future. The new thought is explored, which are about dynamic research of multi-flexible bodies of large wind Generators. Further more; the high-performance large wind generators are designed.