Knowledge graph is a new knowledge representation method Speaker Accessories in the mobile Internet era.Knowledge graph refinement is one of the main contents in application of knowledge graph and its main goal are completion and error detection.At the same time, knowledge graph refinement is usually applied in areas of the information Hay Bags retrieval, robot, intelligent answer and so on.At result, studies on knowledge graph refinement had great significance.This paper addresses the methods of knowledge graph refinement and finally presents challenges of know-ledge graph.