Enforcement Rules of the Government Procurement Act Article 20

For selective tendering procedures where a permanent list of qualified suppliers established by an entity after conducting qualification review has a duration of more than one year, further notices of qualification review shall be published yearly, and the existing permanent list shall also be reviewed and corrected.Where the duration of such list is three years or less, and it has been made clear in the notice of qualification review that further notices will not be published, it shall be sufficient to publish the notice once only . However, the existing permanent list shall still be reviewed and corrected yearly.Where a supplier listed in a permanent list is found to be inconsistent with the original qualification requirements, the entity may set a time-limit for the supplier to provide an explanation. If the supplier fails to provide a reasonable explanation within the time-limit, the entity shall remove it from the list.
中文原文 政府採購法施行細則第20條
機關辦理選擇性招標,其預先辦理資格審查所建立之合格廠商名單,有效期逾一年者,應逐年公告辦理資格審查,並檢討修正既有合格廠商名單。
前項名單之有效期未逾三年,且已於辦理資格審查之公告載明不再公告辦理資格審查者,於有效期內得免逐年公告。
但機關仍應逐年檢討修正該名單。
機關於合格廠商名單有效期內發現名單內之廠商有不符合原定資格條件之情形者,得限期通知該廠商提出說明。
廠商逾期未提出合理說明者,機關應將其自合格廠商名單中刪除。

English translation for reference only; the Chinese text prevails. Not legal advice.