Based on three cases of different literal similarity degrees,the method classifies the threshold of degree A and degree B (Degree A is classing key word),and provides a scientific classification.

• 根据字面相似度值的三种不同情况，通过语义逻辑关系分析，确定A级、B级阈值。A级为归类中心词。从而达到最终归类的目的，使归类结果更具科学性。