Earth fault feeder detection is a long-standing problem in neutral ineffectively earthed power systems.Hierarchical clustering analysis is an important technique in studying for multi-source information integrating and processing，and is introduced and applied in feeder grounding fault protection.A method that can quantitatively discriminate the validity of the hierarchical clustering is proposed.The models and methods of hierarchical clustering for information fusion technique in feeder grounding fault protection are presented.The scheme has been verified by EMTP simulation，and the results show that the scheme has high sensitivity and robustness.