What Duolingo score do you need for National Sun Yat-sen University?

You upload your English certificate to the application website. You are exempt from English proof if you are from one of the English-speaking countries the guide lists (including the US, UK, Ireland, Canada, Australia, New Zealand, Singapore and the Philippines), if your previous degree was taught entirely in English and your institution certifies it, or if your previous degree is from an institution in an English-speaking country. The guide gives no Duolingo validity period.

Where a department offers a Chinese track, that track asks for a Chinese proficiency certificate (TOCFL or HSK) as well as English, so check which track you are applying for.

For comparison, the same guide pairs each Duolingo figure with an IELTS one, from 5.0 for Electrical Engineering and Biological Sciences to 7.0 for graduate Computer Science.

The guide does not describe conditional admission or an English pathway for applicants below a department's minimum. Because minimums differ so widely, a score that misses one department may meet another's; compare the entries before you retake.

Requirements vary by programme and change between admissions cycles. The score that binds you is the one on your NSYSU programme page and in your offer letter, so check it there before you book a test.