Form the original names in the collection as well as from the history of the National Palace Museum's collection of artifacts, we know that the Japanese porcelain presently held in the collection of the National Palace Museum in Taipei are all works passed on via the Ch'ing Palace. From among these works, this essay takes Imari Wares as the object of inquiry.Regarding the era of the Imari wares stored in the National Palace Museum, early items date back to the latter half of the 17th century, while later works date from the latter 19th century; obviously these works did not enter the Museum's collection all at once. Generally speaking, since Japan had formally severed relations with Portugal and initiated its "closed door" policy in 1639 (before the Ch'ing Dynasty had begun), it wasn't until the treaty of 1871 that Japan formalized relations with the Ch'ing court. As a result, the latter 17th-century through 18th-century Imari wares in the Ch'ing palace collection could not have been deposited there by Japanese hands. Nonetheless, among the National Palacew Museum's collection of Imari wares are also included important works whose types ressemble to those exported by the Dutch into Europe. However, considering contemporary relations between the Ch'ing court and the Ryukyu Islands, as well as Japan's relations with the same, this essay believes that Imari wares in the National Palace Collection from the "closed door" period very likely entered as tribute from the Ryukyu Islands. Via this critique of porcelain we are not only aided in understanding the contact between Chinese Japanese porcelain industries, but also through a comparison of works from European royal collections are able to see the extent to which the Ch'ing court recognized the quality of Japanese porcelain.