It is known that Kyotoshi existed as suetsukuribe before Ritsuryo system, but it is unknown that Kyotoshi was born because of the spread of producing technique of earthenware or not, and for years to come, except for the special containers used for ritual and so on, the government is considered to have stopped producing earthenware and it is not sure what happened to suetsukuribe under the Ritsuryo system.
律令制以前には陶作部（すえつくりべ）として存在していたことが分かっているが、陶器の生産技術の広まりによるものか、後世においては祭祀などに使う特殊な器を除いて官で陶器の生産を行うことはほとんど無くなったと考えられ、陶作部が律令制のもとでどうなったかも定かではない。