Koryeo celadons, or Koryeo secret color wares, is the celadons produced in the Korea Peninsula during the Koryeo Dynasty(9181392AD.). As a whole, they had been greatly influenced by Chinese northern and southern celadons in the Song and Yuan Dynasties. Especially in its early time, Koryeo celadons, from graze to shape, obviously imitated Yue kiln 越 in Zhe Jiang Province and Yao zhou kiln耀州 in Shan Xi Province. Later they gradually had their ownfeatures. Ancient Korean celadon originated from two traditions. One was Chinese celadons, Including Yue kiln and Longquan kiln龍泉 in Zhe jiang province, Yao zhou kiln in Shan xi province and Ru zhou kiln 汝州 in Henan province. First, it imitated, then formed its own style. The other carried forward the high-temperatured greyies-green glaze potteries existing just before the unification of Silla統一新羅, from which, we can find the influence of Chinese proto-porcelains. Under the influence of celadons, the pottery clay was refined to fire crude celadons. At last, these two conditions combined. In its highly-developed period, besides the influence from Yue kiln in Zhejiang province, Koryeo celadons had an direct influence from Chinese northern celadons. The obviously witness was the appearing of numerous decorative pattern wares. It was a milestone that indicated till then the Koryeo celadon, which obsorbed decoration technology from both Chinese northern and southern celadon kilns had completely formed its own style. There s very intimately parental relations between ceramics in Koryeo Dynasty and those in China Song and Yuan Dynasties. On the whole, Koryeo celadon developed under the influence of Chinese ceramics. While its not a course of an indiscriminate imitation but of an all-round absorption and a re-creation. Some of the scoring designs?花 stemed directly from Yue kiln, such as the typical designs of flower and plant scolls, double-butterflies, double parrots, cranes among clouds etc., and also the wave pattern, dragon among cloud design. You can find the corresponding copies among Yue kiln. Some are exactly the same. The prototype of the incised design刻花 and moulded decoration 印花of Koryeo celadon primarily originated from the northern celadon, such as Yao zhou ware and Yue ware etc.,. Some from ceramic white ware of Ding kiln定. The designs included lotus petal, bamboo, peony scrolls, Chinese herbaceous peony, chrysanthemum scrolls, winding grasses, read and wild goose, dragon among cloud, and so on. The lotus petal design was mainly used to decorate the outside wall of bowl or dish. The incised patterns of the inside wall of bowls mainly were all kinds of flowers and plants and also their scrolls. The design of bamboo leaves, reed and wild goose, dragon among cloud decorated the outside wall of bottle and ancient flagon. Inlaid celadon象嵌靑瓷 was the typical production of Koryeo celadon. Its design was mature and varions. The black color and white color were used at the same time and fully displayed their advantages. So the decoration was excellent. The rich and color designs can be divided into flowers and plants, animals, characters, geometric designs used to intersperse and verse. As far as technology is concerned, it belonged to the technics that used slip coating to decorate. But the result indicated it also absorbed the technology of under glaze painting. It was similar to the inserting-and-grinding technology used to decorate metal work. So Korea inlaid celadon was a creative technology which used the technology of damascene for reference and at the same time absorbed the technology of decorating with slip coating used in Chinese northern kilns. There were another two achievements we should pay attention to besides inlaid celadon. One was celadon tile; the other, celadon glaze with copperrred colored ware. As a whole, in the centuries before the 10th A.D., the Korea Peninsula and the Japan archipelago had their respective ceramics conditions which were different from that of Chinese ceramics. While from 10th century on, under the influence of Chinese northern and southern ceramics production, the production in Korea had an rapid improvement, and gradually kept up with China. In some places of Japan, the high-temperature graze wares appeared about the 10th century. While the appearance of real porcelain in Japan was some centuries later than that in Korea. The 10th century was a turning point. Before that, the ceramics in Japan and in Korea were very similar. After that , the ceramics in China and in Korea tended to be the same. To some degree, Korea not only accepted the influence of Chinese ceramics and re-created and developed it, but also probably became a transferred station in the course of the east spread of Chinese ceramics and its technology.