Marine creature is the most active subject in marine ecological system. The interactions among them are complex and important. Ontology as a sharing concept formal model can well express these relationships. In order to solve the role problem of marine organisms in these complex problems protean relationships, we introduced the role theory of Hoze and used it to describe the relationships. On this basis, we chose Text2Onto to realize the automatic acquisition of the ontology elements first, and then through the artificial confirmation and used Hozo to edit, thus completed the semi automation of marine organism ontology construction. Experimental results demonstrate this semi-automatic ontology building method can reach high accuracy and recall in marine organism field.