As an experienced legislator, Su launched a magisterial campaign in 2001 and was elected with over 51% of the votes, becoming the second member of the Democratic Progressive Party to ever hold the position.

With his academic experience in physics, he was hired by IBM Taiwan to serve as its patent attorney.

Having been elected three times in a row, Su worked to decrease the difference in resource distribution between northern and southern Taiwan.

For example, he worked with international ecologists and planned to build a research center near the habitat of black-faced spoonbills with a goal to preserve these endangered birds.

The exhibitions attracted more than 600 thousand visitors gaining NT$400 million from export orders.

[5][6] He ended his Taipei mayoral bid in July, choosing to contest the same office in Tainan.