This paper introduces the basic classification of Ondol, the number and form of main entrance, distribution as a basis for classification. And it introduces the various practices and structural characteristics of Ondol. Details are introduced in various forms Ondol of the working principle. In the paper, it also did a more detailed exposition for some of the concepts right.

1. Purpose of the study and term definition of Ondol
  1.1 Background and purpose of the study
  1.2 Word's definition of Ondol
 2. Classification of Gorae Ondol(Gudle)
  2.1. Oassification by Forms of Gorae Ondoi(Gudle)
 3. Oassification by position and number ofGoraeOndol(Gudle)
  3.1 Oassification by number of 'Gorae'
 4. Classification of 'Gorae Gudle' by Agungi(fire hole)
  4.1 'Dang Gorae' (~ .:::il cH)
  4.2 'Nae Gidle'(L/l T ~)
 Conclusion

• Jung Bong Kim(Prof Ph. D. Beijing university of technology) Corresponding Author
• Young Jeong Joo(Prof Ph. D. Beijing university of technology)
• Jong Ho Ok(Prof Ph. D. Beijing university of technology)
• Youn Sook Hwang(Prof Ph. D. Beijing university of technology)