The kiln industry that developed in the area around the southwestern coast of the Korean peninsula during the earliest period of celadon in Korea became concentrated around Kangjin and Puan from a certain period. The kilns that had been formerly built in brick were replaced by those in mud by this period. The bowls with a pi-shaped foot rings, which were once quite popular as to comprise the half of the entire products, became only a small part in a wide variety of pottery types. These changes apparently reveal a transformation in the use of celadon.*br* Among the early celadon kilns, however, except for the one at S?-ri, very few produced celadon ware that could be related to that of Kangjin in shape. This may be due to the fact that the production structure and the products were transformed as the celadon production system improved. In other words, unlike the early celadon kilns, which used brick structure, the new mud-built kilns around the Kangjin kilns created new types in shape and mass-produced such wares throughout the country. Moreover, most Kory? celadons excavated in Japan were discovered in the strata of the same period and give parallels for the circumstances in Korea.*br* The reform of provincial structures during the reign of King S?ngjong (995) and of King Hy?njong (1017), which led to the serious reorganization of the provincial system, must have affected the celadon production system. The setting up of Changh?ng-bu in 1124, the transference of a prefecture in Y?ngam to Changh?ng, and the dispatch of officials to the Kangjin area in 1172 for the first time, all seem to relate to the active production of celadon ware.*br* During this period. the most popular typical style was not only produced around the Kangjin area, but also profusely produced in the Puan area. This situation probably stimulated ceramic production in other local areas and the wares produced there would have privately accommodated to the taste of aristocrats, powerful official s and Buddhist monasteries. The model for the production must have been the celadon produced in the Ceramic-Manufacturing Department (Chagiso), which was then in Kangjin. The Kangjin style thus became widely spread in the homogeneous style and production method.