This paper aims to discuss comprehensively how the habitual, a kind of grammatical category, is realized in Korean. In Chapter 2, reviewed the prior studies and confirmed that ‘habitual’ can be defined as expressing some characteristic situations, via some actions appearing repeatedly over a long, different periods of time. In Chapter 3, after revealing that there are ‘-곤 하-’ and ‘-어 버릇하-’ as mark of Korean habitual, observed the characteristics of the constructions which they form each. The results showed that the constructions by ‘-곤 하-‘ could not represent the situation that can not be repeated, the truth and the general situation, such as permanent attribute. Also they could not co-occur with the expressions that specified a particular short time point or how many times the situations was repeated. Furthermore, although the constructions by ‘-어 버릇하-’ are similar in many ways to the constructions by ‘-곤 하-’, there are some differences that the subject should be animate and it mainly represents a situation in which the subject actively performs an action in that it is a relatively less grammaticalizated expression.