The present paper introduced the methods for assessing structural knowledge. The techniques described in this paper were: knowledge elicitation, knowledge representations, and evaluation of an individual's knowledge representations. For students with hearing impairment, Pathfinder Network analysis techniques rely on graph theory to accomplish the limitations of paper-and-pencil test. The more teachers know about the knowledge structure, the more students' knowledge changed. The present paper provides different dimensions to display deaf students' structural knowledge representations. In addition to quantifying the degree of relatedness between concepts in a content domain, awareness and understanding of the nature of deaf students' underlying knowledge structure is important for teaching practice.