The main purpose of this paper is to examine the pattern and the characteristics of exclamatory sentences according to the aspects of cognitive working of Korean. Since the researches of such sentences have mainly been achieved in terms of the classification of type of sentences, researches of ‘-ku-’ class final ending , such as ‘-ku, -kuna’, or the mood-related take most parts. The main interests of this research are to establish the boundary of the exclamatory sentences in terms of pragmatics in a broad sense; to set it up extensively; and to study the aspects of cognitive working when we speak to exclamatory sentences. The exclamatory sentences can be classified into two types: 1. reflected exclamatory sentences: instant expression when a person responses from a stimulus 2. cognitive exclamatory sentences: relatively more lagged responses than reflected exclamatory sentences due to time required to think and response.