In this study, the bound noun are investigated syntactically and semantically. The result of this study can be concluded as follows : The bound noun in middle korean can be classified by semantic function. The classified bound noun are as follows : First, `kot, pa, chul` as event-object bound noun. Second, `kot, nom, pun, I, cha` as human being bound noun. Third, `nyok, kat, ti, psgeu, chok, je, jeuseum` as time bound noun. Fourth, `nyok, tae, man, pa, chak` as place bound noun. And, fifth, `kajang, tot, tae, man, staram, spun, yang, tye` are included into abstract bound noun. In this study, I investigate which lexical items belong to a free noun, clitic and the ending of a word through the syntactic and semantic study of the bound noun in middle korean. In general, the bound noun require the definite word such as verbal adjective, reference verbal, or nominal as a syntactic and semantic precedent. And it is difficult to define the characteristics of the bound noun since ad-nominal form of the bound noun has various clitic or verbal constraints. So, it is desir to make a study on the bound noun in korean and thus make a full escription on the diachronic development of the bound noun in the korean language.