Haji ware evolved in the 4th century AD (during the Tumulus period) from the Yayoi ware of the preceding period. The ornate decorations of Yayoi pottery were replaced by a plain, undecorated style, and the shapes began to become standardized. Great amounts of this pottery were produced by dedicated craft workshops in what later became the provinces of Yamato and Kawachi, and spread from there throughout western Japan, eventually reaching the eastern provinces. Some Haji ware pottery has been found in the enormous tombs of the Japanese emperors. By the end of the 5th century, Haji pottery was imitating Sue ware forms.
Haji ware evolved in the 4th century AD (during the Tumulus period) from the Yayoi ware of the preceding period. The ornate decorations of Yayoi pottery were replaced by a plain, undecorated style, and the shapes began to become standardized. Great amounts of this pottery were produced by dedicated craft workshops in what later became the provinces of Yamato and Kawachi, and spread from there throughout western Japan, eventually reaching the eastern provinces. Some Haji ware pottery has been found in the enormous tombs of the Japanese emperors. By the end of the 5th century, Haji pottery was imitating Sue ware forms. In the Nara period, Haji ware was often burnished and smoke-blackened by being fired in an oxygen-reduction atmosphere but at low temperatures. This sub-style is known as kokushoku-doki. Haji ware came to an end with the development of glazes and ceramics in the late Heian period. During a 2007 underwater archaeology survey on Ojikajima by the Asian Research Institute of Underwater Archaeology, examples of Chinese ceramics and Haji ware was recovered.