International Airport Park Development Act Article 34

Foreigners intending to undertake business activities inside Airport Park may apply through an Airport Park Enterprise to Airport Corporation for permission from the visa authority and acquire visas when arriving in the Republic of China.Airport Park enterprises applying on behalf of foreigners as prescribed in the preceding paragraph shall guarantee that the applicants will only undertake the activities permitted during their stay in Airport Park.
中文原文 國際機場園區發展條例第34條
外國人士進入園區從事商務活動,得經園區事業代向機場公司申請核轉簽證機關許可,於抵達中華民國時申請簽證。
園區事業對於依前項規定代為申請入國之外國人士,應保證其入區期間從事與許可目的相符之活動。

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