The purpose of this paper is to investigate the direction of developing Korean Language Textbook for the students who emigrated from North Korea to prepare the integrated Korean language education system in a Reunification Era. North Korean Refugee Students have difficulty adapting themselves to their new schools in South Korea in communication, learning, culture, identity, and so on. Developing Korean language textbook can help them overcoming the language and education heterogeneity problems between South and North Koreas. We have focus group interviewed teachers who teach the refugee students and students from North Korea and analyzed their needs for the Korean Language Textbooks. Reflecting their needs, we have established the character of the textbook not only as a make up for their lack of learning but also as a standard textbook for enhancing critical and creative linguistic competence. In addition, we proposed requisites in selecting education contents and the text unit constructing scheme for the standard textbook for the North Korean Refugee students.