Current system of the advanced and optional subjects in Korean language curriculum have failed to develop well balanced linguistic competence due to providing learners with specialized subjects based on content spheres. Korean language curriculum for high school course should aim at educating student to be a well cultured person with excellent linguistic competence. So I propose new system of high school course for Korean language education as follows. 1. Lets replace current optional subjects by canons of all fields. 2. Learning activities must include hearing, speaking, reading, writing and grammar. 3. Students can use textbook for reference providing knowledges and cases for learning activities. 4. The national academic aptitude test Ⅰ must assess all competences of hearing, speaking, reading, writing, grammar and literature. The national academic aptitude test Ⅱ assess writing competence on topics.