This　paper　is　mainly　about　the　design　of　web　information　retrieval　module　based　on　ontology,　using　ontology　technology,　from　the　current　web　service　mechanism　based　on　the　syntax　level　raised　to　the　level　of　knowledge　(or　concept).　First,　the　paper　introduces　the　concept　of　the　ontology,　and　then　completes　the　architecture　of　the　web　information　retrieval　module　based　on　ontology,　with　the　technology　of　information　extraction　and　semantic　extension.　This　technology　applies　to　web　information　retrieval,　providing　more　accurate,　intelligent　web　information　retrieval　service　for　the　users,　and　improve　the　recall　and　precision　ratio.