Abstract: An ontology knowledge representation model for spatial relation is established.Based on point set denotation of SRC-Ontology,arithmetic morphological operators is adopted,and a spatial topological relation widening representation method including 6 species,43 types of three basic spatial entities,namely points,lines,and areas,is proposed.This representation method not only wides SRC-Ontology's 8 topological relation representation method,and provides more explicit formalization representation for spatial relation ontology modeling,but also make the practical application possible.The experimental result proves the feasibilities and validity of the proposed method.