Since 1990s, ontology has been applied to many domains gradually. Construction method of domain ontology has become a very hot research topic. On the basis of analyzes and summarizes the existing experience of ontology construction, this paper proposes a domain ontology construction method. The methodology is in accordance with human’s thoughts, and it owns strong operability and expansibility. Moreover, it uses the method and constructs photo domain ontology. The experiments show that the proposed approach is very scientific, effective and promising.