关键词: WordNet, 相似度, 主成分分析

Abstract: Ontology mapping is a focus research field today，even the computation of concept similarity is the key part to it.Most algorithms combine multiple strategies，however these algorithms have some problems such as computing largely，setting weight hardly etc.This paper proposes a modified algorithm－PCASim.It reduces computation by computing similarity of concept name and modifies weight by PCA.The experiment shows that the algorithm is viable.

Key words: WordNet, similarity, Principal Component Analysis（PCA）