Nationality Act Article 2

A person shall have the nationality of the R.O.C. under any of the conditions provided by the following Subparagraphs:1. His/her father or mother was a national of the R.O.C. when he/she was born.2. He/she was born after the death of his/her father or mother, and his/her father or mother was a national of the R.O.C. at the time of death.3. He/she was born in the territory of the R.O.C., and his/her parents cannot be ascertained, or both were stateless persons.4. He/she has undergone the naturalization process.The provisions of Subparagraphs 1 and 2 of the preceding Paragraph shall also apply to those under the age of 20 at the time of the amendment and implementation of this Act on February 9, 2000.
中文原文 國籍法第2條
有下列各款情形之一者,屬中華民國國籍:
一、出生時父或母為中華民國國民。
二、出生於父或母死亡後,其父或母死亡時為中華民國國民。
三、出生於中華民國領域內,父母均無可考,或均無國籍者。
四、歸化者。
前項第一款及第二款規定,於本法中華民國八十九年二月九日修正施行時未滿二十歲之人,亦適用之。

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