Collocation relation is the most basic relationship among relation words. How to classify it into the basic relationship among ontology conception is a question urgent to be solved in ontology modeling of relation words. In this paper, from set and the basic nature of 2-tuple relation, we can prove that part-of relation and collocation relation can be expressed as the relation of partial ordering. What's more, the connection theory of Clausal can be used to prove that collocation relation can be classified as part-of relation, which makes the ...