[9] During the Sunflower Student Movement, Chiu served as spokesman for a group of over three hundred lawyers that pledged legal aid to protesters.

[1][11] Chiu worked with fellow lawyer Tseng Wei-kai on the Hualon Textile [zh] workers' compensation case.

[21][22] In December 2017, Chiu published his first book in the Chinese language, Stand By You, about several of the legal cases he had worked up to that point in time.

[31] In October 2015, Chiu claimed that Ker had not responded to offers for the two candidates to debate each other before integration polling started.

[32] With no deal in place to conduct integration polling,[33] Chiu formally registered his legislative candidacy by the November 2015 deadline.

[34] Chiu's campaign partnered with that of Hu Po-yen, Hung Tzu-yung, Ko Shao-chen [zh], and Freddy Lim, winning early support from Lin Yi-hsiung.

[41][42] After Chiu Hsien-chih lost the election to Ker Chien-ming,[43] he was named to a NPP task force on legislative reform.

[49][50] Following the departure of Hung Tzu-yung from the party, the NPP continued attempts to convince Chiu to return as chair.

[51] Chiu refused to resume the chairmanship, and stated that either Hsu Yung-ming or Tseng Wei-kai should run for the position.