Expository text is a text-type which deliveries informations based on real facts and accidents, posed by the opposite of narrative text. This text-type also is divided with text-type for information-transfer and text-type for persuasion. The former has the characteristics in form of text. They are explained based on rhetorics, As modificand is located at ending and every modifiers precede, amin idea is located the latter half in body, and it is supported by basis of logical arguments. The text is divided with prologue - body - epilogue in a whole text. The more important thing is that The text-type for information-transfer has a few semantic structures, namely ``superstructure`` represented in mind of text-reader. They are ``structures of comparision and conterast, cause and effect, problem and solving, collection``. They influence reading comprehension and writing outline. located sentence of the back. These have to be described in Korean curriculum.