This research develops a new approach to query expansion by integrating Association Rules (AR) and Ontology. In the proposed approach. there are several steps to expand the query. namely (1) the document retrieval step; (2) the step of query expansion using AR; (3) the step of query expansion using Ontology. https://www.nacrack.com/super-save-2001-2004-LEXUS-LS430-Sedan-Rear-Bumper-Cover-w-o-Park-Assist-Paint-Code-3P2-hot-choice/