This thesis examines what is the implication of Hallidayan linguistics in Korean Education theory. In details, I`ve taken into consideration of the viewpoint of language education in Sydney. The range of Hallidayan language theory does not reside in the description of linguistic units. Halliday thought highly of the context and the relationship between meaning and form. He has always tried to elucidate the meaning potential, which is regarded as linguistic competence in his theory. All his concepts could work successfully in key words of Korean Education and Curriculum planning. Now Korean Educationalists can not explain the linguistic competence or performance as a whole. I think all the key words are inclined to be understood according to each school. Eventually, these key concepts do not work effectively in National Curriculum planning. Curriculum planning is the significant field in Korean Education theory. But these days, no theory are likely to explain the National policy. The Hallidayan key concepts could play a important role in Korean Education theory apart from the National policy.