This study is conducted to put the simulation based model of network in analyzing the particle `-ro`. The previous works of simulation based model has proved its adequacy in explaining the systematic structure of polysemous verbs. It draws particular attention whether this model could be applied to Korean particles. In traditional approaches, Korean particles are regarded as case-markers, and case marking to be purely grammatical elements devoid of semantic content. However, polysemy is the normal situation for both lexical and grammatical morphemes. And, in Cognitive Grammar, only symbolic units are required even for the description of grammatical structure. Therefore, the particle `-ro` is also supposed to have the meaning network of polysemy which is grounded on the simulated experience, with corresponding constructions interacting with it. In conclusion, the semantics network of `-ro` has turned out to have 8 extended meanings connected to one basic meaning, overall structure of which is parallel to the case of verbs. For the sake of authenticity, the result is attested by corpus data.
