This paper reveals that the users of the pomology information retrieval system possess similar pomology knowledge structures after conducting questionnaire survey and interviews. Why such high consistency appears is explained by the comparison and analysis of the non-pomology-information- retrieval-system users. In the end, Based on the above conclusion, the method of simulating the searcher’s professional knowledge structure by using the theory of pomology ontology is released in order to provide a theoretical exploration for the future information retrieval system, which will be more efficient and intelligent.