This paper presents an ontology merging method based on concept lattice’s attribute reduction, which first conducts an analysis on the extension and connotation of the concept in the original sources. With this background, this paper constructs the concept lattice, then conducts attribute reduction on the concept lattice, removes redundant information on the ontology merging, and reduces any unnecessary attribute. All this is done to use the minimum amaunt of information that accurately reflects the nature and structure of the concept lattice and the body. Finally, an example analysis is used to prove the feasibility of this method.