The purpose of this article is to study the catalog, the syntactic, and semantic features of korean complex adverbial case marker on the basis of the korean complex particle’s conception. To achieve this objective, firstly all the korean adverbial case markers recorded in the ‘Standard Korean Language Dictionary’ and ‘Yonsei Korean Dictionary’ were presented. And then a criterion for distinguishing between the fluid forms and the complex adverbial case markers was set up. The result of the verification is 8 complex adverbial case markers in korean. Finally, ‘eso, edaga’, ‘robuteo, roseo’, ‘ero’ which means ‘location’, ‘a starting point’, ‘direction’ were researched. And also ‘irago’, ‘bogo’, ‘hago’s’ syntactic and semantic features were studied.