Current information retrieval (IR) approaches do not formally capture the explicit meaning of a query. Ontology-based approaches allow for sophisticated semantic search but impose a query syntax more difficult to handle. Through the analysis of user’s query habits and query phrase, we found that a simple query phrase usually verb-object phrase. For the field of chemistry knowledge and scientific effects of the characteristics of the user’s query habits, we present an approach for translating natural language queries to ontology knowledge.