National Sun Yat-sen University
Yang had been a research associate at the Sun Yat-sen Center for Policy Studies of the National Sun Yat-sen University in Kaohsiung in 1986–2000. Yang had been the adviser for the Ministry of Foreign Affairs in 1998, Mainland Affairs Council and Ministry of National Defense since 2000. He was a lecturer at the National Sun Yat-sen University in 2000–2009.