The invention relates to a method and system for dynamically grouping demand response resources. the method comprises acquiring an initial clustering center of demand response resources according to an Euclidean distance between corresponding features of each demand response resource, Furthermore, the demand response resource initial clustering center is utilized for clustering the demand responseresource, so as to overcome the defect of inaccurate clustering results of the existing demand response resource dynamic clustering technology, obtain accurate and reasonable clustering results of the demand response resource, improve the calculation reliability of the generation reserve capacity, and promote the orderly development of the power grid.