This paper investigated the concept and principle of sequence in Korean language subject, specially reading contents. Sequence is arranging the curriculum contents according to the grade, semester, and units. This term is frequently confused with related terms such as hierarchy, articulation and alignment. These terms should be discriminated each others. Sequence is to arrange curriculum contents, and hierarchy is to discriminate the interrelationship between the related content elements. Articulation is to decide the relationship between elementary and secondary school levels. Most basic principle of sequence is to ``repeating and deepening`` which was originated from Bruner`s squirrel curriculum theory. There were few specific principles of sequence for reading area. So, in this paper, five types and 14 specific principles were developed. Five types are knowledge, skill, attitude, text, and learning activity.