 Chang represented the Democratic Progressive Party in the 2004 elections and won a seat in the Legislative Yuan via proportional representation.Near the end of her term, Chang served on the Home and Nations Committee.She advocated for the legislature to pass a bill similar to Jessica's Law in March 2007, and stated in June that Chinese spouses of Taiwanese nationals should continue to be granted citizenship after eight years of residency, not four, considering the state of national security, Cross-Strait relations, and population density.